Dua seeking refuge from four things before salam
اللّهُـمَّ إِنِّـي أَعوذُ بِـكَ مِـنَ البُخْـلِ،...
اللّهُـمَّ إِنِّـي أَعوذُ بِـكَ مِـنَ البُخْـلِ، وَأَعـوذُ بِـكَ مِـنَ الجُـبْن، وَأَعـوذُ بِـكَ أَنْ أُرَدَّ إِلى أَرْذَلِ العُـمُر، وَأَعـوذُ بِكَ مِنْ فِتْنَـةِ الدُّنْـيا وَأَعـوذُ بِكَ مِـنْ عَذابِ القَبْر
Allahumma innee aAAoothu bika minal-bukhl, wa-aAAoothu bika minal-jubn, wa-aAAoothu bika an uradda ila arthalil-AAumur, wa-aAAoothu bika min fitnatid-dunya wa-aAAoothu bika min AAathaabil-qabr
Translation
O Allah, I take refuge with You from miserliness, and I take refuge with You from cowardice, and I take refuge with You from being returned to the worst of old age, and I take refuge with You from the trials of the world, and I take refuge with You from the punishment of the grave.
When to recite
Recited before salam during prayer.
Source / Reference
Al-Bukhari 6/35