Isaiah 1:3

Isaiah 1:3. The ox knoweth his owner, and the ass his master’s crib: but Israel doth not know, my people doth not consider.

See how the Lord still owns the children of Israel as his people, though he contrasts their conduct with the behavior of the ox and the ass. So we see that, however far God’s people may have gone into sin, they are his people still, and he does not deny their relationship to him: "Israel doth not know, my people doth not consider."