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Luke 1
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.

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Blameless is different from sinless.

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Let's look at them both, closer.

1) blameless, deserving no censure, free from fault or defect

sin(less)
1) to be without a share in
2) to miss the mark
3) to err, be mistaken
4) to miss or wander from the path of uprightness and honour, to do or go wrong
5) to wander from the law of God, violate God's law, sin

They didn't wander from God's commandments and ordinances.