Those who used to say: two prostrations for every lapse

Ibrahim and al-Sha'bi say: For every mistake (sahw) two prostrations are obligatory.

It is likewise reported from al-Sha'bi; they both said: For every lapse (sahw) there are two prostrations.

Sayyiduna Thawban (may Allah be pleased with him) said that the Prophet (peace and blessings be upon him) said: "For every lapse (sahw) there are two prostrations."

Abu Farwah said: Abd al-Rahman bin Abi Layla led us in prayer. When he sat, he (mistakenly) moved to stand up, and he performed the two prostrations of forgetfulness (sahw).

Yahya bin Sa'id said: Sayyiduna Anas (may Allah be pleased with him) led us in two rak'ahs of Asr on a journey. When he sat in the second rak'ah, he forgot to say the salam and began to stand up, at which the people said "Subhan Allah". When he sat down, he said the salam and performed the two prostrations of forgetfulness.

Abd al-Aziz bin Suhayb said: Sayyiduna Anas bin Malik (may Allah be pleased with him) sat in the third rak'ah, so the people behind him said "Subhan Allah". He stood up and completed the fourth rak'ah. When he said the salam, he performed the two prostrations of forgetfulness. Then he turned towards the people and said: "When you are in doubt (or make a mistake), do like this."

Abu Ja'far and Ata said: Forgetfulness (sahw) is only in addition and deficiency.