Hadith-1"
"The Messenger (Sallal lahu alaihi wa sallam) informed Mu’adh bin Jabal, when he was going to the land of Yemen, “You are going to a people from the People of the Book. Let the first thing that you call them to be the worship of Allah. If they acknowledge Allah, then inform them that Allah has obligated upon them five prayers during their days and nights.[Al-Bukhari, Muslim]"

Hadith-2
"The Prophet (Sallal lahu alaihi wa sallam) explained the pillars of this faith in which every human must believe, when he was asked, "What is iman?", he said, "To believe in Allah and His angels and His books and His messengers and the Last Day and predestination of good and evil." [Al-Bukhari, Muslim]"

Hadith-3
"The prophet (Sallal lahu alaihi wa sallam) was reported saying: Allah grants wealth to he loves and whom he heats, but He does not grant Iman except to his beloved ones. [As Silsila As-Sahiha-2714]"