'Keep' in the Bible

'Thus said Jehovah of Hosts: If in My ways thou dost walk, And if My charge thou dost keep, Then also thou dost judge My house, And also thou dost keep My courts, And I have given to thee conductors among these standing by.

When ye fasted with mourning in the fifth and in the seventh months -- even these seventy years -- did ye keep the fast to Me -- Me? And when ye eat, and when ye drink, is it not ye who are eating, and ye who are drinking?