Sayyiduna Malik bin al-Huwayrith (may Allah be pleased with him) said: We came to the Messenger of Allah (peace and blessings be upon him) as a group of people, young men close in age, and we stayed with him twenty nights. The Messenger of Allah (peace and blessings be upon him) was very compassionate, gentle and forbearing. He perceived that we were longing for our families and yearning for them, so he asked us about those we had left behind, and we told him. Then he (peace and blessings be upon him) said: "Return to your families, stay among them, teach them (the religion) and command them." And he said: "When the time of prayer comes, let one of you give the adhan, and let the eldest of you lead you in prayer."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16686