'Custom' in the Bible

according to the custom of the priest's office, his lot was to enter into the temple of the Lord and burn incense.

And he came in the Spirit into the temple: and when the parents brought in the child Jesus, that they might do concerning him after the custom of the law,

And when he was twelve years old, they went up after the custom of the feast;

And he came to Nazareth, where he had been brought up: and he entered, as his custom was, into the synagogue on the sabbath day, and stood up to read.

And he came out, and went, as his custom was, unto the mount of Olives; and the disciples also followed him.