Reference: Fataawa Noor ‘alad-Darb – Question No.6383, Page 211, Volume 12
Question: Is there anything [authentically] reported regarding sending prayers and salutations upon the Prophet (sal-Allaahu ‘alayhi wa sallam) on the night of jumu’ah?
Response: The Prophet (sal-Allaahu ‘alayhi wa sallam) commanded the Muslim to increase in sending prayers and salutations upon the Prophet (sal-Allaahu ‘alayhi wa sallam) on the day of jumu’ah. In addition, the matter of increasing in sending prayers and salutations upon the Prophet (sal-Allaahu ‘alayhi wa sallam) at all times is [something which is] legislated.