That's not a C, but a G:
relicto igitur initii Chr[is]t[i] verbum
This Latin is not the Vulgate at all, but a separate Latin translation made prior to it part of what's collectively known as the Old Latin texts. (This is not to be confused with Old Latin, the form of Latin before the Classical period.)
The form of 'Christi' here is a Greek 'nomen sacrum'...