Hadith: O Allah, forgive those of us who are living and those of us who are dead, those of us who are young and those who are old, those of us who are males and those who are females, and those of us who are present and those who are absent. O Allah, whoever of us You give life, let him live upon Islam, and whoever of us You take in death, let him die in a state of faith. O Allah, deprive us not of his reward, and subject us not to temptation after his death

عن أَبي هريرة وأبي قتادة وَأبي إبراهيم الأشهلي عن أبيه -وأبوه صَحَابيٌّ- رضي الله عنهم عن النبيِّ صلى الله عليه وسلم أنه صلى على جِنَازَةٍ، فقال: «اللهم اغفر لِحَيِّنَا ومَيِّتِنَا، وصغيرنا وكبيرنا، وذَكرنا وأُنثانا، وشَاهِدِنَا وغَائِبِنَا، اللهم مَنْ أَحْيَيْتَهُ مِنَّا فَأَحْيِهِ على الإسلامِ، ومَنْ تَوَفَّيْتَهُ مِنَّا فَتَوَفِّهِ على الإيمانِ، اللهم لا تَحْرِمْنَا أَجْرَهُ، ولا تَفْتِنَّا بَعْدَهُ».
[صحيح] - [حديث أبي هريرة: رواه ابن ماجه (1/ 480 رقم1498)، وأحمد (14/ 406 رقم8809). وحديث أبي قتادة: رواه أحمد (37/ 248 رقم22554). وحديث الأشهلي: رواه أحمد (29/ 87 رقم17545)]

Abu Hurayrah, Abu Qatādah, and Abu Ibrahīm al-Ash'hali - from his father (who was a Companion) - reported that the Prophet (may Allah's peace and blessings be upon him) once offered the funeral prayer over a deceased person and said the following: "O Allah, forgive those of us who are living and those of us who are dead, those of us who are young and those who are old, those of us who are males and those who are females, and those of us who are present and those who are absent. O Allah, whoever of us You give life, let him live upon Islam, and whoever of us You take in death, let him die in a state of faith. O Allah, deprive us not of his reward, and subject us not to temptation after his death."
[Authentic hadith] - [Narrated by Ibn Majah - Narrated by Ahmad]

Explanation

Whenever the Messenger of Allah (may Allah's peace and blessings be upon him) offered the funeral prayer over a deceased person, he would say what means: "O Allah, forgive all of the Muslims, the living and the dead, the young and the old, the males and the females, the present and the absent. O Allah, whoever of us You give life, let him live while holding firmly to the teachings of Islam, and whoever of us You take his soul in death, let him die in a state of faith. O Allah, do not deprive us of the reward of bearing the calamity of his death, and do not let us go astray after his death."