مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 936
Prayer
Blessing on the Prophet, and its Excellence - Section 3
وَعَن رويفع أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: مَنْ صَلَّى عَلَى مُحَمَّدٍ وَقَالَ: اللَّهُمَّ أَنْزِلْهُ الْمَقْعَدَ الْمُقَرَّبَ عِنْدَكَ يَوْمَ الْقِيَامَةِ وَجَبَتْ لَهُ شَفَاعَتِي ". رَوَاهُ أَحْمد
Ruwaih' reported God’s Messenger as saying, “If anyone invokes a blessing on Muhammad saying, ‘O God, cause him to occupy the place near You on the day of resurrection’, he will be guaranteed my intercession.” Ahmad transmitted it.
Mishkat al-Masabih, 936ضَعِيف (الألباني)