Sforno on Genesis 12:5/ספורנו על בראשית י״ב:ה׳

1ויצאו ללכת ארצה כנען, a land of which they had heard that it was singularly suited for people of their religious beliefs, a land in which the true G’d could be worshipped without hindrance.

2ויבאו ארצה כנען, as opposed to Terach, who had also set out originally to go to the land of Canaan but had stopped at Charan, these people with Avram at their head made good on their intention.