It was narrated from Abu Darda’ that the Messenger of Allah ﷺ said:
“A military expedition by sea is like ten expeditions by land. The one who suffers from seasickness is like one who gets drenched in his own blood in the cause of Allah.”

حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، حَدَّثَنَا بَقِيَّةُ، عَنْ مُعَاوِيَةَ بْنِ يَحْيَى، عَنْ لَيْثِ بْنِ أَبِي سُلَيْمٍ، عَنْ يَحْيَى بْنِ عَبَّادٍ، عَنْ أُمِّ الدَّرْدَاءِ، عَنْ أَبِي الدَّرْدَاءِ، أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ " غَزْوَةٌ فِي الْبَحْرِ مِثْلُ عَشْرِ غَزَوَاتٍ فِي الْبَرِّ وَالَّذِي يَسْدَرُ فِي الْبَحْرِ كَالْمُتَشَحِّطِ فِي دَمِهِ فِي سَبِيلِ اللَّهِ سُبْحَانَهُ " .