اللَّهُمَّ ثَبِّتْ قَدَمَيَّ عَلَى الصِّرَاطِ يَوْمَ تَزِلُّ فِيهِ الْأَقْدَامُ
Allahumma thabbit qadamayya 'alas-sirati yawma tazillu fihil-aqdam
O Allah, keep my feet firm on the Bridge (Sirat) on the Day when feet will slip.
While washing the feet during wudu
This dua asks for firmness when crossing the Sirat bridge on the Day of Judgment.