Charles Ellicott Commentary Acts 7:5

"and he gave him none inheritance in it, no, not so much as to set his foot on: and he promised that he would give it to him in possession, and to his seed after him, when [as yet] he had no child." — Acts 7:5 (ASV)

And he gave him none inheritance.—The apparent exception of the field and cave of Machpelah (Genesis 23:9–17) was not a real one. That was purchased for a special purpose, not given as an inheritance.