It is narrated from Sayyiduna Wathilah bin al-Asqa' (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever could not take part in jihad with me, let him wage jihad at sea."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Sa'id bin Abd al-Aziz except Ibn Ulathah; Amr bin al-Husayn is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 8352
Hadith Gradingمحدثین:إسناده ضعيف لضعف عمرو بن الحصين
Hadith Takhrij«قال الهيثمي: وفيه عمرو بن الحصين وهو ضعيف «مجمع الزوائد ومنبع الفوائد، ج 5، ص 281»»