1023 - وَ رَوَى سَهْلُ بْنُ اَلْيَسَعِ فِي ذَلِكَ عَنِ اَلرِّضَا عَلَيْهِ اَلسَّلاَمُ أَنَّهُ قَالَ: «يَبْنِي عَلَى يَقِينِهِ وَ يَسْجُدُ سَجْدَتَيِ اَلسَّهْوِ بَعْدَ اَلتَّسْلِيمِ وَ يَتَشَهَّدُ تَشَهُّداً خَفِيفاً. Hadith.1023 - Sahl ibn al-Yas'a narrated regarding this matter from Imam al-Ridha {a.s}, who said: "He should base his actions on certainty and perform the two prostrations of forgetfulness after the Tasleem (salutation), and make a brief tashahhud in them."