Strong’s Greek
G3134 — maran
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
μαρὰν ἀθά μαράνα θά
maran — pronounced atha {mar'-an ath'-ah
of Chaldee origin (meaning our Lord has come); maranatha, i.e. an exclamation of the approaching divine judgment:--Maran-atha.
1 occurrence in the KJV.
1 Corinthians 16:22
If any man love not the Lord Jesus Christ, let him be Anathema Maranatha.