'Blameless' in the Bible

These are the records of the generations of Noah. Noah was a righteous man, blameless in his time; Noah walked with God.

Now when Abram was ninety-nine years old, the Lord appeared to Abram and said to him,“I am God Almighty;Walk before Me, and be blameless.

Now Abimelech had not come near her; and he said, “Lord, will You slay a nation, even though blameless?