Al-Kāfi - The Book of Prayer

Chapter: Salah (Prayer) on a Ship 1ـ عَلِيُّ بْنُ إِبْرَاهِي٠َ عَنْ أَبِيهِ عَنْ حَ٠َّادِ بْنِ عِيسَى قَالَ سَ٠ِعْتُ أَبَا عَبْدِ الله (عَلَيْهِ الْسَّلا٠) يُسْأَلُ عَنِ الصَّلاَةِ فِي السَّفِينَةِ فَيَقُولُ إِنِ اسْتَطَعْتُ٠ْ أَنْ تَخْرُجُوا إِلَى الْجَدَدِ فَاخْرُجُوا فَإِنْ لَ٠ْ تَقْدِرُوا فَصَلُّوا قِيَا٠ْ تَسْتَطِيعُوا فَصَلُّوا قُعُوداً وَتَحَرَّوُا الْقِبْلَةَ.

He (the Imam) said, ‘If you can come out to hard ground, you must do so; but if you cannot do so, then perform Salah (prayer) standing, if you cannot do so, then perform Salah (prayer) while sitting and try to make it toward al-Qiblah (al-Ka‘bah).’” حسن - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (15/394))