Luke 1:4

4 That thou mightest know the certainty of those things, wherein thou hast been instructed.

Luke 1:4 In-Context

2 Even as they delivered them unto us, which from the beginning were eyewitnesses, and ministers of the word;
3 It seemed good to me also, having had perfect understanding of all things from the very first, to write unto thee in order, most excellent Theophilus,
4 That thou mightest know the certainty of those things, wherein thou hast been instructed.
5 There was in the days of Herod, the king of Judaea, a certain priest named Zacharias, of the course of Abia: and his wife was of the daughters of Aaron, and her name was Elisabeth.
6 And they were both righteous before God, walking in all the commandments and ordinances of the Lord blameless.
The King James Version is in the public domain.