Sunan Abi Dawud Book 2, Hadith 78

then he may remain sitting (after praying two RAKAHS) or may go for his work.

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Abu Qatadah reported the Messenger of Allah (May peace be upon him) as saying; when any one of you enters the mosque, he should pray two RAKAHS before sitting down.

Sunan Abi Dawud Book 2, Hadith 77
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O Allah, forgives him; O Allah, have mercy on him.

Sunan Abi Dawud Book 2, Hadith 79