'My Covenant' in the Bible

“For the mountains may be removed and the hills may shake,But My lovingkindness will not be removed from you,And My covenant of peace will not be shaken,”Says the Lord who has compassion on you.

For thus says the Lord,“To the eunuchs who keep My sabbaths,And choose what pleases Me,And hold fast My covenant,

“Also the foreigners who join themselves to the Lord,To minister to Him, and to love the name of the Lord,To be His servants, every one who keeps from profaning the sabbathAnd holds fast My covenant;

“As for Me, this is My covenant with them,” says the Lord: “My Spirit which is upon you, and My words which I have put in your mouth shall not depart from your mouth, nor from the mouth of your offspring, nor from the mouth of your offspring’s offspring,” says the Lord, “from now and forever.”