What is the origin of word testify?

The word "testify" originates from the Latin word "testificari", which means "to bear witness" or "to give evidence". The usage of this word can be traced back to ancient Rome, where it was used in legal proceedings and court cases. From its Latin roots, the word "testify" was adopted into Old French as "testifier" and later into Middle English as "testifien" or "testifie", eventually evolving into the modern form of "testify" in English.