Narrated Abu Sa'eed Al-Khudri: that the Messenger of Allah ﷺ said: "There is no Prophet except that he has two ministers among the inhabitants of the heavens, and two ministers among the inhabitants of the earth. As for my two ministers from the inhabitants of the heavens, then they are Jibril and Mika'il, and as for my two ministers from the inhabitants of the earth, then they are Abu Bakr and 'Umar".
The companions of the prophet PBUH played an important role in spreading Islam throughout Arabia during his lifetime as well as after his death. They followed his teachings closely and strived hard to spread it among people so that everyone could benefit from it. This hadith is a reminder for us all that we should follow their example in order to gain Allah's pleasure and blessings upon ourselves too.