and for bowing: he sits cross-legged. In the position of prostration and in the sitting positions, however, he sits with his left foot laid flat, except when sitting in tawarruk (1).
Spreading one’s forearms while prostrating, …
His statement, “Spreading one’s forearms while prostrating,” means that it is disliked for one to spread one’s forearms out while in prostration. He specified “while prostrating” because this is where it occurs. The Prophet ﷺ said, “Be moderate in prostration, and let none of you spread his forearms as a dog spreads them out.” (2) A person should not imitate an animal, for Allah has mentioned likening a human being to an animal only in contexts of condemnation. As Allah Most High says:
“The example of those who were entrusted with the Torah, then failed to uphold it, is like that of a donkey carrying volumes of books.” [al-Jumu‘ah: 5]
The Prophet ﷺ also said regarding one who speaks while the imam is delivering the sermon: “He is like a donkey carrying volumes of books.” (3)
Allah Most High says:
“Recite to them the account of him to whom We gave Our signs, but he cast them off; so Satan pursued him, and he became one of those who went astray. Had We willed, We could have raised him thereby; but he clung to the earth and followed his own desires. His likeness is that of a dog: if you chase it, it pants, and if you leave it, it pants.” [al-A‘raf: 175–176]
The Prophet ﷺ said, “The one who takes back his gift is like a dog that returns to its vomit. We are not to be described by an evil comparison.” (4)
Thus, a human being is likened to an animal only in a context of condemnation. Accordingly, if imitating animals outside the prayer is blameworthy, then doing so in the prayer is even more so.