In the Gospel of John, chapter 21, Jesus asked Peter three times if Peter loved him, then he asked him to feed his sheep.
Ezekiel 34 may be of use in understanding Jesus' statement to Peter:
Ezekiel 34 World English Bible (WEB) - Public Domain
34 Yahweh’s word came to me, saying, 2 Son of man, prophesy against the shepherds of Israel, prophesy, and tell them, even to the shepherds, Thus says the Lord Yahweh: Woe to the shepherds of Israel who feed themselves! Shouldn’t the shepherds feed the sheep? 3 You eat the fat, and you clothe yourself with the wool, you kill the fatlings; but you don’t feed the sheep. 4 You haven’t strengthened the diseased, neither have you healed that which was sick, neither have you bound up that which was broken, neither have you brought back that which was driven away, neither have you sought that which was lost; but with force and with rigor you have ruled over them. 5 They were scattered, because there was no shepherd; and they became food to all the animals of the field, and were scattered. 6 My sheep wandered through all the mountains, and on every high hill: yes, my sheep were scattered on all the surface of the earth; and there was no one who searched or sought. 7 Therefore, you shepherds, hear Yahweh’s word: 8 As I live, says the Lord Yahweh, surely because my sheep became a prey, and my sheep became food to all the animals of the field, because there was no shepherd, neither did my shepherds search for my sheep, but the shepherds fed themselves, and didn’t feed my sheep;
The chapter is long thus I omit part of it. The reader may like to study the other parts (10-25) of Ezekiel 34 later.
25 I will make with them a covenant of peace, and will cause evil animals to cease out of the land; and they shall dwell securely in the wilderness, and sleep in the woods. 26 I will make them and the places around my hill a blessing; and I will cause the shower to come down in its season; there shall be showers of blessing. 27 The tree of the field shall yield its fruit, and the earth shall yield its increase, and they shall be secure in their land; and they shall know that I am Yahweh, when I have broken the bars of their yoke, and have delivered them out of the hand of those who made slaves of them. 28 They shall no more be a prey to the nations, neither shall the animals of the earth devour them; but they shall dwell securely, and no one shall make them afraid. 29 I will raise up to them a plantation for renown, and they shall be no more consumed with famine in the land, neither bear the shame of the nations any more. 30 They shall know that I, Yahweh, their God am with them, and that they, the house of Israel, are my people, says the Lord Yahweh. 31 You my sheep, the sheep of my pasture, are men, and I am your God, says the Lord Yahweh.
Ezekiel 34 may be of use in understanding Jesus' statement to Peter:
Ezekiel 34 World English Bible (WEB) - Public Domain
34 Yahweh’s word came to me, saying, 2 Son of man, prophesy against the shepherds of Israel, prophesy, and tell them, even to the shepherds, Thus says the Lord Yahweh: Woe to the shepherds of Israel who feed themselves! Shouldn’t the shepherds feed the sheep? 3 You eat the fat, and you clothe yourself with the wool, you kill the fatlings; but you don’t feed the sheep. 4 You haven’t strengthened the diseased, neither have you healed that which was sick, neither have you bound up that which was broken, neither have you brought back that which was driven away, neither have you sought that which was lost; but with force and with rigor you have ruled over them. 5 They were scattered, because there was no shepherd; and they became food to all the animals of the field, and were scattered. 6 My sheep wandered through all the mountains, and on every high hill: yes, my sheep were scattered on all the surface of the earth; and there was no one who searched or sought. 7 Therefore, you shepherds, hear Yahweh’s word: 8 As I live, says the Lord Yahweh, surely because my sheep became a prey, and my sheep became food to all the animals of the field, because there was no shepherd, neither did my shepherds search for my sheep, but the shepherds fed themselves, and didn’t feed my sheep;
The chapter is long thus I omit part of it. The reader may like to study the other parts (10-25) of Ezekiel 34 later.
25 I will make with them a covenant of peace, and will cause evil animals to cease out of the land; and they shall dwell securely in the wilderness, and sleep in the woods. 26 I will make them and the places around my hill a blessing; and I will cause the shower to come down in its season; there shall be showers of blessing. 27 The tree of the field shall yield its fruit, and the earth shall yield its increase, and they shall be secure in their land; and they shall know that I am Yahweh, when I have broken the bars of their yoke, and have delivered them out of the hand of those who made slaves of them. 28 They shall no more be a prey to the nations, neither shall the animals of the earth devour them; but they shall dwell securely, and no one shall make them afraid. 29 I will raise up to them a plantation for renown, and they shall be no more consumed with famine in the land, neither bear the shame of the nations any more. 30 They shall know that I, Yahweh, their God am with them, and that they, the house of Israel, are my people, says the Lord Yahweh. 31 You my sheep, the sheep of my pasture, are men, and I am your God, says the Lord Yahweh.