Ref: Duas.org
It is reported through authentic sources that Imam Zainul Abideen (as) used to recite the following Salawat every day in Sha`ban at the time sun passes the meridian (waqt-e-Zawal) and on the night of 15th Sha`ban.
The salawat is as under & confirms the exalted position of the Ahlulbayt