When a Muslim is questioned in the grave, he testifies that no deity is worthy of worship except Allah and that Muhammad is the Messenger of Allah
عَنِ البَرَاءِ بْنِ عَازِبٍ رضي الله عنه أَنَّ رَسُولَ اللَّهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ قَالَ: «المُسْلِمُ إِذَا سُئِلَ فِي القَبْرِ: يَشْهَدُ أَنْ لاَ إِلَهَ إِلَّا اللَّهُ وَأَنَّ مُحَمَّدًا رَسُولُ اللَّهِ»، فَذَلِكَ قَوْلُهُ: {يُثَبِّتُ اللَّهُ الَّذِينَ آمَنُوا بِالقَوْلِ الثَّابِتِ فِي الحَيَاةِ الدُّنْيَا وَفِي الآخِرَةِ} [إبراهيم: 27].
Explanation
The believer is questioned in the grave by the two angels assigned with this task, namely Munkar and Nakīr, whose names are mentioned in several Hadīths. The believer testifies that none is worthy of worship except Allah and that Muhammad is the Messenger of Allah.
The Prophet (may Allah's peace and blessings be upon him) said that this is the firm word about which Allah Almighty says: {Allah keeps those who believe steadfast with the firm Word [of faith] in the life of this world and in the Hereafter.} [Surat Ibrāhīm: 27]
Source
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