When there are three persons, one of them should lead them. The one among them most worthy to act as Imam is one who is best versed in the Qur'an.

The one who is most versed in Allah's Book should act as Imam for the people, but If they are equally versed in reciting it, then the one who has most knowledge regarding Sunnah if they are equal regarding the Sunnah, then the earliest one to emigrate; it they emigrated at the same time, then the earliest one to embrace Islam. No man must lead another in prayer where (the latter) has authority, or sit in his place of honour in his house, without his permission. Ashajj in his narration used the word, age in place of Islam.

We came to the Messenger of Allah (ﷺ) and we were all young men of nearly equal age. We stayed with him (the Holy Prophet) for twenty nights, and as the Messenger of Allah may peace be upon him) was extremely kind and tender of heart, he. therefore, thought that we were eager (to see) our family (we felt home-sickness). So he asked us about the members of the family that we had left behind and when we informed him, he said: Go back to your family, stay with them, and teach them (beliefs and practices of Islam) and exhort them to good, and when the time for prayer comes, one amongst you should-announce Adzan and then the oldest among you should lead the prayer.