"Fear of the Lord" or Fear of God refer to fear or a specific sense of respect, awe, and submission to a deity. People subscribing to popular monotheistic religions might fear divine judgment, hell or God's omnipotence.
The first mention of the fear of God in the Hebrew Bible is in Genesis 22:12, where Abraham is commended for putting his trust in God. In Isaiah 11:1-3, the prophet describes the shoot that shall sprout from the stump of Jesse, "The spirit of the Lord shall rest upon him: a spirit of wisdom and of understanding, A spirit of counsel and of strength, a spirit of knowledge and of fear of the Lord, and his delight shall be the fear of the Lord." Proverbs 9:10 says that "fear of the Lord" is "the beginning of wisdom".
The Hebrew words יִרְאַ֣ת (yir’aṯ) and יִרְאַ֣ת (p̄aḥaḏ) are most commonly used to describe fear of God/El/Yahweh.
Bahya ibn Paquda characterized two types of fear as a lower "fear of punishment" and a higher "fear of [divine awe] glory." Abraham ibn Daud differentiated between "fear of harm" (analogous to fear of a snake bite or a king's punishment) and "fear of greatness," analogous to respect for an exalted person, who would do us no harm. Maimonides categorized the fear of God as a positive commandment, as the feeling of human insignificance deriving from contemplation of God's "great and wonderful actions and creations."
According to Jerry Bridges, "There was a time when committed Christians were known as God-fearing people. This was a badge of honor."
From a theological perspective "fear of the Lord" encompasses more than simple fear. Robert B. Strimple says, "There is the convergence of awe, reverence, adoration, honor, worship, confidence, thankfulness, love, and, yes, fear." In the Magnificat (Luke 1:50) Mary declaims, "His mercy is from age to age to those who fear him." The Parable of the Unjust Judge (Luke 18:1-8) finds Jesus describing the judge as one who "...neither feared God nor cared for man." Some translations of the Bible, such as the New International Version, sometimes replace the word "fear" with "reverence".