Sunan Abi Dawud Book 2, Hadith 77
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.
I met ‘Uqbah b. Muslim and said to him: it has been reported to me that someone has narrated to you from the prophet (ﷺ) that when he entered the mosque, he would say: I seek refuge in Allah, the Magnificent, and in His noble face, and in his eternal domain, from the accursed Devil. He asked : is it so much only? I said: Yes. He said: when anyone says so. The devil says: he is protected from me all the day long.
then he may remain sitting (after praying two RAKAHS) or may go for his work.