But when he saw their hands not reaching for it, he distrusted them and felt from them apprehension.1 They said, "Fear not. We have been sent to the people of Lot."
Translation: Saheeh International (English)
1 Traditionally, if a guest refused to eat, it meant that he harbored ill will toward the host or intended him harm.
But when Abraham saw that their hands did not reach out for the calf and that they were not eating it, he was confused by them, and felt fear of them. When the angels saw his fear of them, they told him not to be afraid, and that they had been sent by Allah to the people of Lot to give them their punishment.