BEG THE FOLLOWING DU'AA AFTER EVERY FARDH SALAAT

Allaahumma antas salaam wa minkas salaam tabaarakta yaa zal jalaali wal ikraam

O Allah!Only You are the Giver of Peace and only from Your Side is peace obtained. Very blessed are You, O Owner of Greatness and Majesty, Bestower of Honour and Beneficence.

(Fat'h-ul-Qadeer vol. 1 p. 439)

Mullaa Ali Qaari rahmatullahi alayh has stated in Mirqaat (vol. 2 p.258) that,
ilayka yarji’us salaamu fahayyinaa Rabbanaa bissalaami wa adkhilnaa daaras salaam
has no basis in the Traditions; instead it is an addition from some story tellers.
and recite:

Allaahumma Laa Maani'a limaa a'tayta wa Laa mu'tiya limaa mana'ta wa Laa yanfa'u dhal jaddi minkal jadd

O Allah! None can prevent that which You give and none can give that which You prevent and no wealthy person's wealth can save him from Your Punishment.

THE SUNNAH OF COMING OUT OF THE MOSQUE