2 Samuel 10.18 – David killed 700 Syrian charioteers

Legendary is the reign of David, seen in the numerous battles he won for the Lord, including this one against the Syrians,

Then the Syrians fled before Israel; and David killed seven hundred charioteers and forty thousand horsemen of the Syrians, and struck Shobach the commander of their army, who died there (2 Samuel 10.18). 

Both 7 and 40 can have symbolic meaning in the Bible. Whether 7 has any special meaning here, it is hard to tell. David victory over Syria was complete and perfect, no doubt, because he did whatever the Lord told him to do.