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