“Incline your ear and come to Me. Listen, that you may live; And I will make an everlasting covenant with you, According to the faithful mercies shown to David. (Isaiah 55:3)

• everlasting covenant. The New Covenant that God will give to Israel.
• my steadfast, sure love for David. The Davidic Covenant promised David that his seed would be ruler over Israel in an everlasting kingdom. Paul connected the resurrection of Christ with this promise (Acts 13:34), since it was an essential event in fulfilling this promise. If he had not fully satisfied God by his atoning death, he would not have risen; if he had not risen from the dead, he could not eventually sit on David’s earthly throne.
• But he did rise and will fulfill the kingly role. The whole world will come to him as the Great King. (John MacArthur)h

If we come to God to serve him, he will covenant with us to do us good and make us happy; such are his condescension to us and concern for us. God’s covenant with us is an everlasting covenant – its contrivance from everlasting, its continuance to everlasting. The benefits of this covenant are mercies suited to our case, who, being miserable, are the proper objects of mercy. They come from God’s mercy, and are ordered every way in kindness to us. (Matthew Henry)