Translation:

171. When We shook the mount over them as if it had been a canopy and they thought it was going to fall on them (We said): "Hold firmly to what We have given you and bring (even) to remembrance what is therein; perchance ye may fear Allah."

Notes (Tafseer)

1144. Cf. ii. 63 and n.

1145. Therein = in the Book or Revelation, in "what We have given you."