Translation of the verse 27 from Surah Ta-Ha : Number of verses 135 - - page 313 - Part 16.
"And make loose the knot (the defect) from my tongue, (i.e. remove the incorrectness from my speech) [That occurred as a result of a brand of fire which Musa (Moses) put in his mouth when he was an infant]. [Tafsir At-Tabari, Vol. 16, Page 159].
And untie the knot from my tongue
(20:27) and remove the impediment from my tongue