It was narrated from Hudhaifah that the Prophet (ﷺ) used to say between the two prostrations: “Rabbighfir li, Rabbighfir li (O Lord forgive me, O Lord forgive me
It was narrated that Ibn ‘Abbas said: “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).’”