hadith
3306
۞
Imam al-Sadiq (AS) narrated, 'When Ali b. al-Husayn [i.e. Imam Zayn al-Abidin] (AS) used to go down in prostration, he would not raise his head up again until he was dripping with sweat.
الإمامُ الصّادقُ (عَلَيهِ الّسَلامُ): كانَ عليُّ بنُ الحسينِ (عَلَيهِ الّسَلامُ) ... إذا سَجَدَ لَم يَرفَعْ رَأسَهُ حتّى يَرْفَضَّ عَرَقاً.