Qalb
Heart — under the left breast
Qalb, the heart-latifa, located by Sirhindī two finger-widths beneath the left breast. It is the seat of īmān (faith) and the first of the lataif to be 'awakened' in the Naqshbandi sulūk. In Kubrā's visionary phenomenology its light is yellow, and it is associated with the prophet Adam. The qalb is not the muscle of the heart but the metaphysical heart that receives divine address — the locus of the famous ḥadīth qudsī, 'My earth and My heaven contain Me not, but the heart of My believing servant contains Me.'
Point 1 of 6 in Lataif al-Sitta (Six Subtle Centers)
Cross-tradition overlaps
No overlapping points are registered for this point.
Sources
Sirhindī, Maktūbāt I.260 (primary_canonical)
Maktūbāt I.260 (First Daftar, Letter 260) gives the Mujaddidi account of the subtle centres, including qalb's position beneath the left breast and its association with faith and Adam. The citation documents a Sufi subtle-body schema, not an anatomical claim about the cardiac muscle.
Kubrā, Fawāʾiḥ al-Jamāl §51 (primary_canonical)
“The first of the subtle lights to appear is the yellow light of the heart.”