7 is used in the Bible more than 7 hundred times. Considering words related to 7 like 7 fold or seventy or seven hundred, the count is higher.
First use of the number 7 in the Bible relates to the creation week in Genesis The 7 day is the Sabbath a holy day of rest (Deuteronomy 5:12)
7 is identified with something being finished, complete, or divine perfection. The command for animals to be at least 7 days old before being used for sacrifice (Exodus 22:30), the command for leprous Naaman to bathe in the Jordan River 7 times to effect complete cleansing (2 Kings 5:10), the command for Joshua to march around Jericho for 7 days (and on the 7th day to make seven circuits) and for 7 priests blow 7 trumpets outside the city walls (Joshua 6:3–4). 7 signifies a completion of some kind: a divine mandate is fulfilled.
7 pairs of each clean animal on the ark (Genesis 7:2); 7 stems on the tabernacle’s lampstand (Exodus 25:37); 7 qualities of the Messiah in Isaiah 11:2; 7 signs in John’s Gospel; 7 things the Lord hates in Proverbs 6:16; 7 parables in Matthew 13; and 7 woes in Matthew 23.
70 weeks prophecy in Daniel 9:24 concerns 490 years (7 times 7 times 10). Jeremiah 29:10 predicted the Babylonian Captivity would last for 70 years (7 times 10). According to Leviticus 25:8, the Year of Jubilee was to begin after the passing of every 49th year (7 times 7).
Jesus is the 7-fold “I AM” in the Gospel of John. Jesus told Peter to forgive a wrongdoer 70 times 7 times (Matthew 18:22, NKJV). 7 bowls of the Great Tribulation. (Revelation 16:1) or God’s warning to Israel in Leviticus 26:18.
The book of Revelation, 7 is used more than 50 times. 7 letters to 7 churches, 7 spirits before God’s throne (Revelation 1:4), 7 golden lampstands (1:12), 7 stars in Christ’s right hand (1:16), 7 seals of God’s judgment (5:1), 7 angels with 7 trumpets (8:2), etc. 7 represents completeness or totality: the 7 churches represent the completeness of the body of Christ, the 7 seals on the scroll represent the fulness of God’s punishment of a sinful earth. The Book of Revelation, with all its 7’s, is the capstone of God’s Word to man, the Word is complete (Revelation 22:18).
Not every instance of the number 7 in the Bible carries a deep significance. Sometimes, a 7 is just a 7, and we must be cautious about attaching symbolic meanings to any text, especially when Scripture is not explicit about such meanings. But, there are times when God is communicating the idea of divine completeness, perfection, and wholeness by means of the number 7.