These belong to a group of four auxiliary particles called te ni wo ha (or we), which serve to mark the cases of nouns, te (or de) being the sign of the instrumental ablative; ni that of the dative; wo that of the objective, and wa that of the nominative.
ablative הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד