Y'dig?

The Sanskrit word Upanishad come from the verb sad, to sit, with upa, connected with the Latin s-ub, under; and ni, found in English be-neath and nether. The whole thing means a sitting, an instruction, the sitting at the feet of a master. When we read in the Gospels that Jesus “went up into the mountain: and when he was set, his disciples came unto him” we can imagine them sitting at the feet of their Master and the whole Sermon on the Mount might be considered as an Upanishad.

from the introduction to the Penguin Classics edition of the Upanishads, translated by the great unsung, unrecognized genius, Juan Mascaro.