ENOfficial
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.”
Source: sunnah.com
Other translations
Arabic
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 صلى الله عليه وسلم قَالَ " غَزْوَةٌ فِي الْبَحْرِ مِثْلُ عَشْرِ غَزَوَاتٍ فِي الْبَرِّ وَالَّذِي يَسْدَرُ فِي الْبَحْرِ كَالْمُتَشَحِّطِ فِي دَمِهِ فِي سَبِيلِ اللَّهِ سُبْحَانَهُ " .
sunnah.com