The ruling on the salam when entering the mosque

Question:
This questioner says: Honorable Shaykh, does the one who enters the mosque say the salam, whether there is someone in this mosque or not? Because we have heard that the one who enters a mosque remains in goodness and the angels pray for him.

Answer:
Yes, if he sits waiting for the prayer, this is in the hadith, and the angels seek forgiveness for him and make du'a for him. As for the salam, if there is someone in the mosque, it is a sunnah (recommended practice) for him to initiate the salam to them. If there is no one in it, some scholars say he should also say the salam, because the mosque is never devoid of angels, yes, and of the servants of Allah whom one does not see. Allah knows best, yes.