803. hadíth
وَقَالَ إِبْرَاهِيمُ بْنُ أَبِي مَحْمُودٍ لِلرِّضَا عَلَيْهِ اَلسَّلاَمُ: اَلرَّجُلُ يُصَلِّي عَلَى سَرِيرٍ مِنْ سَاجٍ وَ يَسْجُدُ عَلَى اَلسَّاجِ قَالَ «نَعَمْ.
Ibrahim ibn Abi Mahmoud said to Imam Ali ibn Musa Ar-Ridha (a.s) about a man who prays on a bed made of teakwood and prostrates on the teakwood itself. Imam (a.s) replied: "Yes, there is no issue”.