Strong's G1487 — εἰ (conditional)
ei (ei) cond.
1. if, whether, that, etc.
{Often used in connection or composition with other particles,  especially in the comparables}
[a primary particle of conditionality]
KJV: forasmuch as, if, that, (al-)though, whether 
See also: G1437 
Occurrences: 501