In the name of Allah
It is reported through authentic sources that Imam Ali ibn Al-Hussein (AS) used to recite the following Salavat every day in Sha`ban at the time sun passes the merdian (waqt-e-Zawal) and on the night of 15th Sha`ban. The salawat is as follows:
In the name of Allah the Beneficent, the Merciful.
O' Allah! Bestow Your blessing on Muhammad and his progeny-the tree of prophet hood and the trustees of the (Divine) Mission;
, the place of visits of the angels, the mine of Your Knowledge and the people of the Holy House of revelation.
O` Allah I Bestow Your blessing on Mohammad and his progeny who are a boat sailing in the deep waters of fathomless sea. Safe is he who boarded it and drowned is he who discarded it. Those who went ahead of them were misled and those legged behind them were ruined and those who adhered to them were united with them.
O` Allah! Bless Mohammad and his progeny who are the strong refuge, rescue for the distressed and the helpless, shelter for the fugitives and protection.
O` Allah! Bless Mohammad and his Progeny with plenty of Your blessings which should please them and grant them their due and it should be fulfilled with Your might-O` the Lord of the Worlds!
O Allah: (please do) send blessings upon Muhammad and the Household of Muhammad--
the pure, the pious, the righteous whose rights have been made incumbent upon us by You
and the obedience to whom has been deemed obligatory upon us by You and whose (divinely commissioned) leadership has been (also) deemed obligatory upon us by You.
O` Allah! Bless Mohammad and his progeny and embellish my heart with obedience to You and disgrace me not with disobedience to You and bless me with tenderness for one struck with poverty from Your sustenance for You have blessed me with affluence in livelihood and because You have displayed Your justice on me and bestowed life on me to live under Your shade.
And this is the month You have attributed to Your Prophet the chief of Your Prophets month of Sha`aban You have encompassed it with your mercy and pleasure.
The Messenger of god used to keep vigil in devotion during its nights and observed fasts during its days humiliating himself before You honoring and respecting it till his departure from this World.
O` Allah! Help us in following his life pattern and in achieving his intercession.
O` Allah! Appoint him as an intercessor for me and his intercession is accepted by You and appoint him to show us a simple path towards You and make me his follower till I meet You on the day of resurrection in a state that You be pleased with me ignoring my sins for You have prescribed mercy and pleasure from you and my entertainment a peaceful abode and the abode of virtuous people
Ref: shia muslim