The Size Of Mustard Seed Of Faith

The Prophet said that God will say:

مَنْ كَانَ فِي قَلْبِهِ مِثْقَالُ حَبَّةٍ مِنْ خَرْدَلٍ مِنْ إِيمَانٍ فَأَخْرِجُوهُ‏

“Take out (of Hellfire) everyone that has faith in his heart, even if its equal to the size of a mustard seed!”

[“Sahih Bukhari”, 6560].