Allah, the Exalted, says:
"O you who believe! Fear Allah as He should be feared". (3:102)
"So, keep your duty to Allah and fear Him as much as you can..." (64:16)
This second Verse explains the meaning of the first one.
"O you who believe! Keep your duty to Allah and fear Him, and speak (always) the truth". (33:70)
"... And whosoever fears Allah and keeps his duty to Him, He will make a way for him to get out (from every difficulty). And He will provide him from (sources) he never could imagine..." (65:2,3)
"If you obey and fear Allah, He will grant you Furqan [(a criterion to judge between right and wrong), or (Makhraj, i.e., a way for you to get out from every difficulty)], and will expiate for you your sins, and forgive you; and Allah is the Owner of the great bounty". (8:29)