Acts 3:25

Ye are the sons of the prophets, and of the covenant which God made with your fathers, saying unto Abraham, And in thy seed shall all the families of the earth be blessed.

Sons of the prophets ... seems to distinguish among the sons of Abraham, as between the secular descendants like the Pharisees, and those of the true spiritual likeness, here called "sons of the prophets," who were also posterity of Abraham, but in the more meaningful sense.

Sons of the covenant ... clearly refers to the true Israelites, the spiritual seed of Abraham, such as Nathaniel and Zacchaeus.

In thy seed shall all the families of the earth be blessed ... The promise to Abraham is recorded in Genesis 12:3; 22:18; 26:4; and 28:14. "All the families of earth ..." envisions the blessing being poured out upon Gentiles as well as Jews; and "in thy seed" is not a promise that the multitudes of Abraham's posterity will bless mankind, but that the blessing shall come through the seed singular, which is Christ (Galatians 3:16).

Alexander Campbell commented on the Jews being sons of the prophets, taking a slightly different view, thus:

They were educated by the sixteen Jewish prophets, the same being read in their synagogues weekly. Hence, we presume, they were called sons of the prophets; and therefore ought to have recognized and acknowledged their own Messiah.[18]