Musannaf Ibn Abi Shayba 3:277

Yazid ibn Harun narrated to us, from Husayn al-Maktab, from Budayl, from Abu al-Jawza’, from ‘A’ishah, who said: The Prophet, may Allah bless him and grant him peace, forbade that any one of us should spread out his forearms like the spreading out of a beast of prey.