תּלמוד אויף משלי 21:30

Rab Judah said in the name of Rab : Who finds diverse kinds in his garment must divest himself thereof even in the street. What is the reason ? [As it is said,] "There is no wisdom nor understanding nor counsel against the Lord" (Prov. xxi. 30) — i.e. wherever the Divine Name is liable to be profaned, we pay no respect to a teacher.

Against this teaching is quoted : Having buried the dead, and on returning there are two paths before them one clean, the other unclean, if [the mourner] enters the clean path, they follow him there, and if he enters the unclean path, they follow him there out of respect for him! Why should this be so? Let one say, "There is no wisdom nor understanding nor counsel against the Lord"!