Set a watch, O Lord, before my mouth; keep the door of my lips. Ps.
141:3

In the use of language there is perhaps no error that old and young
are more ready to pass over lightly in themselves than hasty, impatient
speech. They think it is a sufficient excuse to plead, "I was off my
guard, and did not really mean what I said." But God's Word does not
treat it lightly. . . .

http://egwlists.whiteestate.org/pipermail/devotional/2006/00...

http://marcharbel.lilhayat.com/Prayer/soujoud.htm
ضع حارسا على شفتيّ حتى تعرف أنت وحدك عطر عذابي وترتضي به. (فاوستينا – 831)