Faith and certainty (yaqin) in Allah's signs

وَجَعَلْنَا مِنْهُمْ أَئِمَّةً يَهْدُونَ بِأَمْرِنَا لَمَّا صَبَرُوا۟ ۖ وَكَانُوا۟ بِـَٔايَـٰتِنَا يُوقِنُونَ

And We made from among them leaders guiding by Our command when they were patient and [when] they were certain of Our signs.