מדרש על שמות 19:12

5) It is written (Shemoth 19:12) "Honor your father and your mother" and (Mishlei 3:9) "Honor the L–rd from your wealth." Scripture likens honoring father and mother to honoring the L–rd.

"He surrounded them": before Mount Sinai, viz. (Shemoth 19:12) "And you shall set bounds to the people roundabout, saying, etc."