رَبِّ اغْفِرْ وَارْحَمْ، إِنَّكَ أَنْتَ الْأَعَزُّ الْأَكْرَمُ
It was reported from the companions and the Tabi'in that they would recite 'Rabbighfir warham, innaka Antal-A'azzul-Akram' between the green markers during Sa'i, and would make personal supplication throughout.