Strong's #853: 'eth (pronounced ayth)
apparent contracted from 226 in the demonstrative sense of entity; properly, self (but generally used to point out more definitely the object of a verb or preposition, even or namely):--(as such unrepresented in English).
Brown-Driver-Briggs Hebrew Lexicon:
'êth
1) sign of the definite direct object, not translated in English but generally preceding and indicating the accusative
Part of Speech: untranslated particle
Relation: apparent contracted from H226 in the demonstrative sense of entity
Usage:
This word is used 7302 times:
Malachi 4:5: "Behold, I will send you Elijah the prophet before the coming"
Malachi 4:6: "lest I come and smite the earth with a curse."