Hadithcore
Mishkat al-Masabih, 900

Ibn ‘Abbas reported that the Prophet (ﷺ) used to say between the two <i>sajdas</i>, “O God, forgive me, show mercy to me, guide me, heal me, and provide for me.” Abu Dawud and Tirmidhi transmitted it.

وَعَنِ ابْنِ عَبَّاسٍ قَالَ: كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ بَيْنَ السَّجْدَتَيْنِ: «اللَّهُمَّ اغْفِرْ لِي وَارْحَمْنِي وَاهْدِنِي وَعَافِنِي وَارْزُقْنِي» . رَوَاهُ أَبُو دَاوُد وَالتِّرْمِذِيّ

References1 variant
In-Book Reference
Book 4, Hadith 324