'Custom' in the Bible

according to the custom of the priesthood he was chosen by lot to enter into the temple of the Lord to burn incense.

And when he was twelve years [old], they went up according to the custom of the feast.

And he came to Nazareth, where {he had been brought up}, and according to {his custom} he entered into the synagogue on the day of the Sabbath and stood up to read.

And he went away [and] proceeded, according to [his] custom, to the Mount of Olives, and the disciples also followed him.