In Zechariah 13 it says a spring will be opened in David's house. What is this spring? It would seem that over 2200 years later, the English songwriter William Cowper would pen "There is a fountain filled with blood, that flows from Emmanuel's veins, and sinners plunged beneath the flood, lose all their guilty stains. This chapter is an amazing view into what Jesus would do, from 400 years before he did it.