ENOfficial
Ibn ‘Abbas reported that the Prophet (ﷺ) used to say between the two sajdas, “O God, forgive me, show mercy to me, guide me, heal me, and provide for me.” Abu Dawud and Tirmidhi transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنِ ابْنِ عَبَّاسٍ قَالَ: كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ بَيْنَ السَّجْدَتَيْنِ: «اللَّهُمَّ اغْفِرْ لِي وَارْحَمْنِي وَاهْدِنِي وَعَافِنِي وَارْزُقْنِي» . رَوَاهُ أَبُو دَاوُد وَالتِّرْمِذِيّ
sunnah.com