Explanation

Hazrat Saad Bin Abi Waqas(RA) is historically associated with the title Amin-ul-Ummat. Hazrat Abu-Ubaidah Bin Al-Jirrah(RA) was a companion but not known for this specific title. Hazrat Abdur Rehman Bin Auf(RA) was known for his wealth and trade acumen. Hazrat Saeed Bin Zaid(RA) was another prominent companion, but the title is linked to Saad (RA).