Abdullah bin Umar (RA) narrates from Rasool-Allah (SAW), "For whoever the door of duaa opened, for him the doors of mercy are opened. Whatever duaa is asked from Allah the best duaa is for well-being and safety among them." (Tirmizi)
Sayyiduna Abu Bakr, Sayyiduna Umar al Farooq, Sayyiduna Uthman Gani and Sayyiduna Ali (radi Allahu anhumul ajmain) were the consecutive successors of Sayyiduna Rasulullah (Sallal laahu alaihi wasallam.)
These four Khulafaa (plural for Caliph) are called the ‘Khulafaa-e-Rashidun” or the “Rightly Guided Caliphs.” Together, these four Khulafaa ruled the Islamic state for about 29 years. They are renowned “Rightly Guided” because they ruled the people of that time exactly according to the Holy Quran and commands of Ssyyiduna Rasulullah (Sallal laahu alaihi wasallam).
Sayyiduna Abdullah ibn Umar (radi Allahu anhu) has said:
Those who are desirous of following anyone, should follow the Sahaba who were the best of community, whose hearts were pure, whose wisdom was profound and who did not believe in the exhibition of outer life. They were a people whom Allah had selected His Nabi (sallal laahu alaihi wasallam) and who extended His religion to the world. Therefore, try to imitate their ways and manners, for by Allah, they were rightly guided people.