Sunan Ibn Majah, Volume 4, Book 24, Hadith 2778 (DarusSalam) ⓘ

It was narrated that Sulaim bin ‘Amr said: I heard Abu Umamah saying: I heard the Messenger of Allah say: “The martyr at sea is like two martyrs on land, and the one who suffers seasickness is like one who gets drenched in his own blood on land. The time spent between one wave and the next is like a lifetime spent in obedience to Allah. Allah has appointed the Angel of Death to seize souls, except for the martyr at sea, for Allah Himself seizes their souls. He forgives the martyrs on land for all sins except debt, but (He forgives) the martyr at sea all his sins and his debt.”

حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ يُوسُفَ الْجُبَيْرِيُّ، حَدَّثَنَا قَيْسُ بْنُ مُحَمَّدٍ الْكِنْدِيُّ، حَدَّثَنَا عُفَيْرُ بْنُ مَعْدَانَ الشَّامِيُّ، عَنْ سُلَيْمِ بْنِ عَامِرٍ، قَالَ سَمِعْتُ أَبَا أُمَامَةَ، يَقُولُ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ ‏ "‏ شَهِيدُ الْبَحْرِ مِثْلُ شَهِيدَىِ الْبَرِّ وَالْمَائِدُ فِي الْبَحْرِ كَالْمُتَشَحِّطِ فِي دَمِهِ فِي الْبَرِّ وَمَا بَيْنَ الْمَوْجَتَيْنِ كَقَاطِعِ الدُّنْيَا فِي طَاعَةِ اللَّهِ وَإِنَّ اللَّهَ عَزَّ وَجَلَّ وَكَلَ مَلَكَ الْمَوْتِ بِقَبْضِ الأَرْوَاحِ إِلاَّ شَهِيدَ الْبَحْرِ فَإِنَّهُ يَتَوَلَّى قَبْضَ أَرْوَاحِهِمْ وَيَغْفِرُ لِشَهِيدِ الْبَرِّ الذُّنُوبَ كُلَّهَا إِلاَّ الدَّيْنَ وَلِشَهِيدِ الْبَحْرِ الذُّنُوبَ وَالدَّيْنَ ‏" ‏ ‏.‏