Try:-http://kotzkblog.blogspot.com/2018/03/166-did-high-priest-have-rope-tied.html
about a 1/4 of the way down you'll find this:-
“...he was to enter into a place more than holy than all. The other priests, the Levites and the people stood around him in three rows and lifted their hands over him in prayer, and a golden chain was tied to his leg. He took three steps and all the others came to a stop and followed him no further. He took three more steps and went round to his place; three more and he closed his eyes and linked himself to the upper world.”[7]
A second reference in the Zohar refers to a ‘golden rope’. “Rav Yitzchak said: ‘A rope was tied to the Kohen’s leg when he went in, so that should he die there they could pull him out.” [8]
Thus we have two textual references to the ‘rope around the ankle’ story.
This jewish blog has investigated this legend, that is his words, and found these two references.
As he comments:-
And finally, assuming a High Priest dies in the Holy of Holies on Yom Kippur, there would be no need to haul him out by a rope, because his body could simply be removed by another Cohen, a Levi, or even a Yisrael if necessary:
As the Talmud states:
“Anyone may enter the sanctuary (Heichal[10]) whether to build, to repair or to remove impurity.”[11]