Tongue tip just above the lower incisors

The mechanic

The tip of the tongue narrows against the space just above the lower front teeth, leaving a slit the air whistles through. Three letters emerge here: ص، ز، س.

Where it occurs

The letters produced at this point

ص ز س

A place in the text

سُبۡحَٰنَ رَبِّكَ رَبِّ ٱلۡعِزَّةِ عَمَّا يَصِفُونَ

The marked spot was located in this ayah's own text at build time — As-Saffat 37:180.