This Bible contradiction is from the Infidels.org.
Acts 7:16 View context
And were carried over into Sychem, and laid in the sepulchre that Abraham bought for a sum of money of the sons of Emmor [the father] of Sychem.
Genesis 23:17 View context
And the field of Ephron, which [was] in Machpelah, which [was] before Mamre, the field, and the cave which [was] therein, and all the trees that [were] in the field, that [were] in all the borders round about, were made sure