'Religious' in the Bible

"Let it be so on this occasion," Jesus replied; "for so we ought to fulfil every religious duty." Then he consented;

“Again, you have heard that it was said to the men of old, ‘You shall not make false vows, but you shall fulfill your vows to the Lord [as a religious duty].’

Then the disciples of John [the Baptist] came to Jesus, asking, “Why do we and the Pharisees often fast [as a religious exercise], but Your disciples do not fast?”

And one of them, an expert in religious law, asked him a question to test him: