Quran 31:4

ٱلَّذِينَ يُقِيمُونَ ٱلصَّلَوٰةَ وَيُؤۡتُونَ ٱلزَّكَوٰةَ وَهُم بِٱلۡأَخِرَةِ هُمۡ يُوقِنُونَ ٤

Who observe the Salat (Contact Prayer), give the Zakat (Obligatory Charity), and as regards to the Hereafter, they are absolutely certain.