After the salam
Begin with Astaghfirullah three times, then the tasbih: SubhanAllah, Alhamdulillah, and Allahu Akbar thirty-three times each.
Reciting Ayat al-Kursi after each prayer is a means of entering Paradise.
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The Adhkar After Every Salah
A short, authentic set of remembrances to recite after the obligatory prayers.