1323. hadíth
وَقَالَ لَهُ إِبْرَاهِيمُ بْنُ مَيْمُونٍ: نَخْرُجُ إِلَى اَلْأَهْوَازِ فِي اَلسُّفُنِ فَنُجَمِّعُ فِيهَا اَلصَّلاَةَ فَقَالَ «نَعَمْ لَيْسَ بِهِ بَأْسٌ» فَقَالَ لَهُ فَنَسْجُدُ عَلَى مَا فِيهَا وَ عَلَى اَلْقِيرِ قَالَ «لاَ بَأْسَ.
Ibrahim ibn Maymun said to him (Abu Abdullah (a.s)): "We travel to Ahwaz in ships, and we combine the prayers on board." He (a.s) replied: "Yes, there is no harm in that." He further asked: "And we prostrate on what is in the ship and on the pitch (tar)?" Imam (a.s) said: "There is no harm."