'Truly I Tell You' in the Bible

I assure you and most solemnly say to you, he will put him in charge of all his possessions.

I assure you and most solemnly say to you, this generation [those living at that definite period of time preceding the second coming] will not pass away until everything takes place.

Jesus said to him, “I assure you and most solemnly say to you, today you will be with Me in Paradise.”