Musannaf Ibn Abi Shaybah

Hazrat Tawus considered it undesirable to reply to a greeting during the sermon or to say "Yarhamukallah" to someone who sneezed.

Ibrahim and Hazrat Ibn Sirin were asked whether the greeting of Salam should be answered during the Friday sermon or not? They replied that whoever tells someone to be quiet has also engaged in unnecessary action.

Ibrahim says that silence is necessary.

Muhammad used to say that if you are greeted with salam during the Friday sermon, then respond by gesturing with your head.

A man asked Hazrat Saeed bin Musayyib whether if someone says "Yarhamuk Allah" to a person who sneezes during the sermon, has he done a vain act? He replied, "No, but he should not do it again."

Hazrat Muhammad bin Ali (may Allah be pleased with him) and Hazrat Qasim say: Respond to the greeting (salaam) in your heart.

Hazrat Abu Al-Haitham says that on Friday, during the sermon, I greeted Ibrahim with salam, but he did not reply to my greeting, and after the prayer was finished, he said that speaking at this time is disliked.