Jamieson, Fausset and Brown on John 7:14-15

14-15. about the midst of the feast--the fourth or fifth day of the eight, during which it lasted.

went up into the temple and taught--The word denotes formal and continuous teaching, as distinguished from mere casual sayings. This was probably the first time that He did so thus openly in Jerusalem. He had kept back till the feast was half through, to let the stir about Him subside, and entering the city unexpectedly, had begun His "teaching" at the temple, and created a certain awe, before the wrath of the rulers had time to break it.