Tosefta על שמות 23:2

It happened [once] that Rabban Gamliel and the Elders2 were reclining [and eating] in Yericho (Jericho). They (i.e. the servants) brought in front of them dates, and they ate them. Rebbi Akiva jumped up and said after [eating them] the Beracha One out of the Three (i.e. Al Haetz (For the Tree)). Rabban Gamliel said to him, “Akiva! What is with you? You are sticking your head into the argument.” He said [back] to him, “Rebbi (My master)! You have taught us ‘to lean after the majority’ (Shemot 23:2). Even though that you say like this and your friends say like this, the law is like the words of the majority.”