Dhikr — Reciprocal Remembrance and the Heart's Tranquility

The Qur'anic semantic field of remembrance: dhikr, tasbīḥ, taḥmīd, takbīr, tahlīl, istighfār, ṣalawāt, tafakkur. Reciprocal dhikr and the tranquility of the heart, with classical tafsir sources.