أُولَٰئِكَ كَتَبَ فِي قُلُوبِهِمُ الْإِيمَانَ
“These are the ones in whose hearts He has inscribed faith.” (Al-Mujādilah 58:22)
وَلَمَّا يَدْخُلِ الْإِيمَانُ فِي قُلُوبِكُمْ
“Faith has not yet entered your hearts.” (Al-Ḥujurāt 49:14)
Both passages explicitly place faith in relation to the heart. They therefore resist any reduction of faith to spoken words alone. Verbal profession remains a means of public manifestation and legal recognition.
The centrality of inward assent is compatible with the importance of profession for worldly dealings.