(Asshuara’) 26 : 118
فَافْتَحْ بَيْنِي وَبَيْنَهُمْ فَتْحًا وَنَجِّنِي وَمَنْ مَعِيَ مِنَ الْمُؤْمِنِينَ
Then You judge between me and them with decisive judgment and save me and believers with me."
Even after calling people to the Straightpath for 950 years, none believed with Noah except a few. So Three-Time-Knower Impartial Lord inspired Messenger Noah to pray as told in this verse.