Musannaf Ibn Abi Shayba 3:3190

Azhar al-Samman narrated to us, from Ibn 'Awn, who said: A man said to Nafi', "I was crowded on the day of Jumu'ah, so I was not able to perform bowing (ruku') and prostration (sujud)." Nafi' said: "As for me, if I were in your place, I would have gestured."