Source: Ben Ish Hai
Behold, I will send you Elijah the prophet before the coming of the great and terrible day of the Lord. [Malachi 3:23]
Elijah comes... only to distance those who were drawn near... and to draw near those who have become distanced... [Eduyot 8:7]
Nowadays, most of the world adheres to falsehood and its accompanying wickedness; "all mankind is deceitful" [Psalms 116:11].
In the future, Elijah will change that. He will distance falsehood - שׁקר - [whose letters are close together] and expel it from the world; and he will draw truth - אמת - [whose letters are far apart] near so that the entire world will adhere to it.
א ב ג ד ה ו ז ח ט י כ ל מ נ ס ע פ צ ק ר שׁ ת