Full Sharh — Mishkat al-Masabih 2062
وَعَنْ أَنَسٍ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: " مِنْ أَرَادَ أَنْ يَنَامَ عَلَى فِرَاشِهِ فَنَامَ عَلَى يَمِينِهِ ثُمَّ قَرَأَ مِائَةَ مَرَّةٍ (قل هُوَ الله أحد) إِذا كَانَ يَوْم الْقِيَامَةِ يَقُولُ لَهُ الرَّبُّ: يَا عَبْدِي ادْخُلْ عَلَى يَمِينِكَ الْجَنَّةَ ". رَوَاهُ التِّرْمِذِيُّ وَقَالَ: هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ
English Translation
He reported the Prophet as saying, “If anyone who is about to sleep on his bed lies on his right side, then recites ‘Say, He is God, One’ a hundred times, the Lord will say to him on the day of resurrection, ‘My servant, enter paradise to your right’.” Tirmidhī transmitted it, saying this is a hasan gharīb tradition.
Source
Mishkat al-Masabih(مشكاة المصابيح)
The Excellent Qualities of the Qur'an
Hadith Number
2062