The medrash tells us as quoted here: https://www.ou.org/holidays/shavuot/offering_the_torah_to_the_nations/ that hashem first offered the Torah to the nations of the world. Each nation asked what does it say in this Torah, Gd responded with one of the commandments and the nation then went on to refuse the Torah as it is something that runs counter to their essence. “When he offered it to the descendants of Yishmael, they could not then, and they cannot now, deal with the prohibition against stealing (Vayikra 19:11), as the Angel of the L-rd said to our mother Hagar about our ancestor, Yishmael, “He will be a person without self-control, with his hand in everyone else’s property, and everyone else’s hand in his property, and he will camp on the borders of everyone else’s land.” (Bereshit :12)”
Of course the Torah is about the descendants of Yitzchak, and of course the Torah says he will steal as in Bereishit 16:12 - where do we find this to the be case historically? What I mean is, Esav said no to the Torah because of "though shall not kill" - we know that Esav tried to kill Yaakov in he bible and throughout the ages, they slaughtered 10's of millions of Jews... Where do we find that destiny of Yishmael that he is all about theft and stealing? Is there any hint of Yishmael being engaged in theft in the bible that this commandment should be reason for them to refuse the Torah?