Spiritual certainty (yaqin)

وَكَذَٰلِكَ نُرِىٓ إِبْرَٰهِيمَ مَلَكُوتَ ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضِ وَلِيَكُونَ مِنَ ٱلْمُوقِنِينَ

And thus did We show Abraham the realm of the heavens and the earth that he would be among the certain [in faith].

ٱلَّذِينَ يُقِيمُونَ ٱلصَّلَوٰةَ وَيُؤْتُونَ ٱلزَّكَوٰةَ وَهُم بِٱلْـَٔاخِرَةِ هُمْ يُوقِنُونَ

Who establish prayer and give zakāh, and of the Hereafter they are certain [in faith].