Abu al-Zubayr narrates from Sayyiduna Jabir (may Allah be pleased with him) that he said: We set out with the Messenger of Allah (peace and blessings be upon him) on a journey, and it rained, so he (peace and blessings be upon him) said: "Whoever of you wishes may pray in his tent."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5509