Tossefta sur Le Lévitique 16:13

Why did [the Kohen Gadol] turn aside and weep (Yoma 1:5)? Because [the Elders] have to make him take an oath, for there had already been an incident involving one Boethusian who offered up the incense when he was outside [the Holy of Holies] and the cloud of incense heated up the whole Temple, for the Boethusians say that the incense should be offered up while he is outside, as it is said (Lev. 16:13), "And the cloud of incense shall cover [the Curtain]." The Sages said to them, is it not already stated (ibid.), "He shall place the incense on the fire before God"^*וְנָתַ֧ן אֶֽת־הַקְּטֹ֛רֶת עַל־הָאֵ֖שׁ לִפְנֵ֣י ה׳ (see GR"A here)? It (i.e., the second part of the verse) teaches that we add the smoke-raising herb [to the incense]. Thus, if one does not add the smoke-raising herb, he is liable for the death penalty. When he came out he said to his fathers, "All your days you were explicating [the verses] and you did not perform it until I stood there and did it myself." He said to him, "Even though we explicate, we do not perform it [as we explicate it], and we hearken to the words of the Sages. I would be astounded for you if your days were to last." And it was not three days after this that they placed him in his grave.