قَالَ أَمِيرُ اَلْمُؤْمِنِينَ عَلِيٌّ عَلَيْهِ اَلسَّلاَمُ: «اِفْتِتَاحُ اَلصَّلاَةِ اَلْوُضُوءُ وَ تَحْرِيمُهَا اَلتَّكْبِيرُ وَ تَحْلِيلُهَا اَلتَّسْلِيمُ.
The Commander of the Faithful Imam Ali ibn Abi Talib (a.s), said: "The initiation of prayer is purification (ablution), its prohibition is the takbir (saying 'Allahu Akbar'), and its permissibility is the Tasleem (saying 'Assalamu Alaikum')."