It is narrated from Sayyiduna Mu'adh bin Anas al-Juhani (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "That I see off a mujahid in the path of Allah and help him on his morning or evening departure is dearer to me than the world and everything in it."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17556