Sayyiduna Imran bin Husayn (may Allah be pleased with him) reports that the Prophet (peace and blessings be upon him) said: "A morning or an evening spent in the path of Allah (or: setting out in the morning or setting out in the evening) is better than the world and everything that is in it."
Al-Bazzar recorded it; its chain contains Yusuf bin Khalid al-Samti, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الجهاد / 9473