“When praying at night (Qiyamul-Lail), the Messenger of Allah ﷺ used to say between the two prostrations: ‘Rabbighfir li warhamni wajburni warzuqni warfa’ni (O Lord, forgive me, have mercy on me, improve my situation, grant me provision and raise me in status).’” (Using translation from Ibn Mājah 898)
أَنَّ رَسُولَ اللهِ ﷺ قَالَ بَيْنَ السَّجْدَتَيْنِ فِي صَلاةِ اللَّيْلِ رَبِّ اغْفِرْ لِي وَارْحَمْنِي وَارْفَعْنِي وَارْزُقْنِي وَاهْدِنِي ثُمَّ سَجَدَ