This was told by Rabbi Israel of Rizhyn.
“All the pupils of my ancestors, the Great Maggid, transmitted the teachings in his name—all except Rabbi Zusya. And the reason for this was that Rabbi Zusya hardly ever heard his teacher’s sermon out to the end. For at the very start, when the maggid recited the verse from the Scriptures which he was going to expound, and began with the words of the Scriptures: ‘And God said,’ or ‘and God spoke,’ Rabbi Zusya was overcome with ecstasy, and screamed and gesticulated so wildly that he disturbed the peace of the round table and had to be taken out. And then he stood in the hall or in the woodshed, beat his hands against the walls, and cried aloud: ‘And God said!’ He did not quiet down until my ancestor had finished expounding the Scriptures. That is why he was not familiar with the sermons of the maggid. […]”
Tales of the Hassidim