It wasnarrated from Abu Hurairah that the Messenger of Allah (ﷺ)said:
"When anyone of you enters the mosque, let him not sit downuntilhe performs two Rak'ah." (JA)
English reference (JA): Vol. 1, Book 5, Hadith 1012 (JA)
Arabic reference (JA): Book 5, Hadith 1065 (JA)