Between the two prostrations

اللّهُـمَّ اغْفِـرْ لي ، وَارْحَمْـني ، وَاهْدِنـي ، وَاجْبُرْنـي ، وَعافِنـي وَارْزُقْنـي وَارْفَعْـني

O Allah forgive me, have mercy on me, guide me, support me, protect me, provide for me, and elevate me.

Abu Dawud, Ibn Majah, At-Tirmidhi. See also Al-Albani, Sahih At-Tirmidhi 1/90 and Sahih Ibn Majah 1/148.