What is the remembrance (dhikr) to be recited by the Imam after the salutation (taslim) and before turning to face the congregants (ma'mumun)? What is the ruling on depositing money in banks without interest and solely for the purpose of preservation?

It is sunnah for the Imam, when he finishes his prayer, to seek forgiveness three times, and to say: "O Allah, You are As-Salam (the Perfection), and from You is all peace, blessed are You, O Possessor of Majesty and Honor." He should not turn to face the congregants until after that.