Man Lā Yaḥḍuruh al-Faqīh
Hadith 13191327 - وَ سَأَلَ عَلِيُّ بْنُ جَعْفَرٍ أَخَاهُ مُوسَى بْنَ جَعْفَرٍ عَلَيْهِمَا اَلسَّلاَمُ عَنِ اَلرَّجُلِ يَكُونُ فِي اَلسَّفِينَةِ هَلْ يَجُوزُ لَهُ أَنْ يَضَعَ اَلْحَصِيرَ عَلَى اَلْمَتَاعِ أَوِ اَلْقَتِّ وَ اَلتِّبْنِ وَ اَلْحِنْطَةِ وَ اَلشَّعِيرِ وَ غَيْرِ ذَلِكَ ثُمَّ يُصَلِّيَ عَلَيْهِ فَقَالَ «لاَ بَأْسَ.
Hadith.1327 - Ali ibn Ja'far asked his brother Imam Musa ibn Jafar Al-Kadhim (as) about a man on a ship: Is it permissible for him to place a mat over goods, straw, wheat, barley, or other items and then pray on it?
Imam (as) said: "There is no harm."