Time to use your critical thinking skills or even better the "Right Spirit" within you to discern the truth within this passage.
“Then Yeshua spoke to the crowds and to His taught ones, saying, “The scribes and the Pharisees sit on the seat of Mosheh. Therefore, whatever (THEY or HE) say to you to guard, guard and do. But do not do according to their works, for they say, and do not do. “For they bind heavy burdens, hard to bear, and lay them on men’s shoulders, but with their finger they do not wish to move them. And they do all their works to be seen by men, and they make their t’fillen wide and lengthen the tzitzit of their garments, and they love the best place at feasts, and the best seats in the congregations, and the greetings in the market-places, and to be called by men, ‘Rabbi, Rabbi.’”
Mattithyahu (Matthew) 23:1-7 TS2009
Verse 4 uses they (the religious leaders) vs he (Moses), however does the context support "they"?
There are not a great deal of "witnesses" to support the singular "he", however bear in mind just how thorough and ruthless people who want truth suppressed can be when it threatens their power. So I ask you in all seriousness, which do you support, the plural or the singular meaning?