And because of this: (Ps. 102:1) A prayer of the pauper, when he enwraps... For all of them become enwrapped because of Her, until She ascends with them, for there is no separation in Her from them.
And this prayer is called ‘heel’ (’aqev), in relation to other prayers, and, because of it, it is stated:iBT Berakhot 30b ‘Even if a snake is wound around his heel, he should not interrupt his prayer’, – even if it surrounds that point which is the tip of the letter Dalet ד – armed with many sins, to instruct condemnation upon the children of the Shekhinah – he should not interrupt for the sake of that point.