beginnest
2 occurrences across the corpus
King James Version
Deuteronomy 16:9
Seven weeks shalt thou number unto thee: begin to number the seven weeks from such time as thou beginnest to put the sickle to the corn.
KJV Apocrypha (Eastern Orthodox Additions)
2 Esdras 11:16
Hear thou that hast borne rule over the earth so long: this I say unto thee, before thou beginnest to appear no more,