Shiavault - a Vault of Shia Islamic Books Nahjul Balagha Part 1, The Sermons Sermon 72: My God, the Spreader of the surfaces... Herein Amir al-mu'minin tells people how to pronounce "as-salawat" (to invoke Divine blessing) on the Prophet.
ومن خطبة له (عليه السلام) علّم فيها الناس الصلاة على رسول الله (صلى الله عليه وآله) ]وفيها بيان صفات الله سبحانه وصفة النبي والدعاء له[ My God, the Spreader of the surfaces (of earth) and Keeper (intact) of all skies, Creator of hearts on good and evil nature, send Thy choicest blessings and growing favours on Muhammad Thy servant and Thy Prophet who is the last of those who preceded (him) and an opener for what is closed, proclaimer of truth with truth, repulser of the forces of wrong and crusher of the onslaughts of misguidance.
As he was burdened (with responsibility of prophethood) so he bore it standing by Thy commands, advancing towards Thy will, without shrinking of steps of weakness of determination, listening to Thy revelation, preserving Thy testament, proceeding forward in the spreading of Thy commands till he lit fire for its seeker and lighted the path for the groper in the dark. اللَّهُمَّ دَاحَيَ الْمَدْحُوَّاتِ، وَدَاعِمَ الْمَسْمُوكَاتِ، وَجَابِلَ الْقُلُوبِ عَلَى فِطْرَتِهَا: شَقِيِّهَا وَسَعِيدِهَا.
He introduced clearly guiding signs and shining injunctions. He is Thy trusted trustee, the treasurer of Thy treasured knowledge, Thy witness on the Day of Judgement, Thy envoy of truth and Thy Messenger towards the people. وَهُدِيَتْ بِهِ الْقُلُوبُ بَعْدَ خَوْضَاتِ الْفِتَنِ، وَأَقَامَ مُوضِحاتِ الاْعْلاَمِ، وَنَيِّرَاتِ الاْحْكَامِ، فَهُوَ أَمِينُكَ الْمَأْمُونُ، وَخَازِنُ عِلْمِكَ الْمخْزُونِ، وَشَهِيدُكَ يَوْمَ الدِّينِ، وَبَعِيثُكَ بِالْحَقِّ، وَرَسُولُكَ إِلَى الْخَلْقِ.
My God prepare large place for him under Thy shade and award him multiplying good by Thy bounty.