This prayer is taken from Sayyidi Habib Umar bin Hafiz’s collection of prayers using Allah’s beautiful names in which he calls upon Allah by His beautiful names and then asks Him to bestow prayers upon His Beloved by those names. Finally, he asks Allah for a portion of those attributes which belong to Allah and which He has bestowed upon His Messenger ﷺ.
اللَّهُمَّ يا اللهُ يا أحَدُ صَلِّ على عَبْدِكَ و حَبِيبِكَ سَيِّدِنا مُحَمَّدٍ النَّبِيِّ الأَحْمَد و على آلِهِ و صَحْبِهِ و سَلِّمْ تَسْلِيماً وأَشْهِدْنِي بِهِ سِرَّ الأَحَدِيِّةِ لَكَ إِشْهَادا
O Allah, O Unique One, bestow abundant prayers and peace upon Your slave and beloved, our Master Muhammad, the Prophet who praises You the most and upon his Family and Companions, and by him allow me to completely witness the secret of Your uniqueness.