'Custom' in the Bible

according to the custom of the priesthood, his lot was to make perfume, having gone into the sanctuary of the Lord,

And he came in the Spirit to the temple, and in the parents bringing in the child Jesus, for their doing according to the custom of the law regarding him,

and when he became twelve years old, they having gone up to Jerusalem, according to the custom of the feast,

And he came to Nazareth, where he hath been brought up, and he went in, according to his custom, on the sabbath-day, to the synagogue, and stood up to read;

And having gone forth, he went on, according to custom, to the mount of the Olives, and his disciples also followed him,