COMMENTARY on 12:79
A. Yusuf Ali:

Translation:
He said: "(Allah) forbid that we take other than him with whom we found our property: indeed (if we did so), we should be acting wrongfully. 1751
Commentary:

1751  There is a little sparring now between the Ten and Joseph. They are afraid of meeting their father's wrath, and he holds them strictly to the bargain which they had themselves suggested.