Source of a passage

I remember reading reading a post on Ananda a while back and something to do with vows. I believe it went some like:

"Deep and wondrous honored one, all knowing pure and still Surangama king of mantras...."

Does anyone know where is comes from? Thanks for reading.

submitted by /u/Lux_Aetheris
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from Buddhism https://ift.tt/2Q2Nwue