acts 7:2 And he said, Men, brethren, and fathers, hearken; The God of glory appeared unto our father Abraham, when he was in Mesopotamia, before he dwelt in Charran, - Free Bible Online

      2-5. The God of glory--A magnificent appellation, fitted at the very outset to rivet the devout attention of his audience; denoting not that visible glory which attended many of the divine manifestations, but the glory of those manifestations themselves, of which this was regarded by every Jew as the fundamental one. It is the glory of absolutely free grace.
      appeared unto our father Abraham before he dwelt in Charran, and said, &c.--Though this first call is not expressly recorded in Genesis, it is clearly implied in Ge 15:7 and Ne 9:7; and the Jewish writers speak the same language.

JFB.