Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna ‘Ubādah bin Sāmit (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) said: “Fight in the way of Allah, for it is one of the gates of Paradise (the Gate of Jihād), and Allah removes through it grief, pain, and distress.”