It was narrated that Malik bin Al-Huwairith said: “I came to the Messenger of Allah صلی اللہ علیہ وآلہ وسلم with a cousin of mine” — once he said, “with a friend of mine” — and he said: ‘When you travel, call the Adhan and Iqamah, and let the older of you lead the prayer.” (Sahih)