From the Talmud:

As our sages say, 'For the first three hours of the day, God learns Torah.’ Babylonian Talmud, Tractate Avodah Zarah 3b

Rabbi Eliezer declares [the oven of Akhnai] ritually pure and the Sages declare it ritually impure…. It has been taught: On that day, Rabbi Eliezer used all the arguments in the world, but they did not accept them from him.… He said to them, “If the halachah is in accordance with me, let it be proved from heaven.” A heavenly voice went forth and said, “Why are you disputing with Rabbi Eliezer, for the halachah is in accordance with him everywhere?” Rabbi Joshua said, “It [the Torah] is not in heaven” [Deuteronomy 30:12]. We pay no attention to a divine voice because long ago at Mount Sinai You wrote in the Torah, “After the majority must one incline” [Exodus 23:2]. Rabbi Nathan met Elijah and said to him, “What did the Holy One do at that time?” [Elijah] replied, “God laughed and said: ‘My sons have defeated Me. My sons have defeated Me.’”

Babylonian Talmud, Tractate Bava M’tzia 59b