Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) says: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever provides shade for one going out on a military expedition, Allah will provide shade for him on the Day of Resurrection; whoever equips one going out on an expedition until he is fully provided for will receive a reward equal to the fighter's, until he is martyred or returns; and whoever builds a mosque in which the name of Allah is remembered, Allah will build a house for him in Paradise."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18571