John Calvin on Acts 7:4

4. Then going out. The readiness and willingness of faith is commended in these words. For when he is called he maketh no delay, but maketh haste “Non procrastinat, sed moras omnes rampit,” he does not procrastinate, but breaks off all delay. and subdueth all his affections, that they may obey the holy commandment of God. It is uncertain for what cause he stayed at Charran; yet it may be that the weakness of his father caused him to tarry there, who, as we read, died there shortly after; or else, because he durst go no further, until such time as the Lord had told him whither he should go. It is more like to be true in mine opinion, that he was stayed there a while with the wearisomeness and sickness of his father, because Stephen saith plainly that he was brought thence after the death of his father.

Acts 7: 5-8

5. And he gave him none inheritance in it, no, not the breadth of a foot; and promised that he would give it to him to possess, and to his seed after him, when as he had no son. 6. And God spake after this manner, Thy seed shall sojourn in a strange land; and they shall bring it into bondage, and shall evil entreat it four hundred years. 7. But the nation whom they shall serve will I judge, said God. And afterwards they shall come out, and shall worship me in this place. 8. And he gave him the covenant of circumcision: and so he begat Isaac, and circumcised him the eighth day; and Isaac begat Jacob; and Jacob begat the twelve patriarchs.