Dua of Musa (Moses) A.S for good speech, when he was sent by Allah to Pharaoh:
"O my Lord! Open for me my chest (grant me self-confidence, contentment, and boldness).
"And ease my task for me;
"And make loose the knot (the defect) from my tongue, (i.e. remove the incorrectness from my speech)
"That they understand my speech ”
“rabbi ishrah lee sadree .Wayassir lee amree .Waohlul AAuqdatan min lisanee
Yafqahoo qawlee ”