A primary particle of conditionality; if, whether, that, etc. -- forasmuch as, if, that, (al-)though, whether. Often used in connection or composition with other particles, especially as in eige, ei de me(ge), ei kai, ei me, ei me ti, ei per, ei pos, ei tis, ek. See also ean.
KJV: And saith unto him, If thou be the Son of God, cast thyself down: for it is written, He shall give his angels charge concerning thee: and in their hands they shall bear thee up, lest at any time thou dash thy foot against a stone.
NASB: and said to Him, "If You are the Son of God, throw Yourself down; for it is written, 'HE WILL COMMAND HIS ANGELS CONCERNING YOU'; and 'ON their HANDS THEY WILL BEAR YOU UP, SO THAT YOU WILL NOT STRIKE YOUR FOOT AGAINST A STONE.'"
KJV: And if thy right eye offend thee, pluck it out, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell.
NASB: "If your right eye makes you stumble, tear it out and throw it from you; for it is better for you to lose one of the parts of your body, than for your whole body to be thrown into hell.
KJV: And if thy right hand offend thee, cut it off, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell.
NASB: "If your right hand makes you stumble, cut it off and throw it from you; for it is better for you to lose one of the parts of your body, than for your whole body to go into hell.
KJV: But if thine eye be evil, thy whole body shall be full of darkness. If therefore the light that is in thee be darkness, how great is that darkness!
NASB: "But if your eye is bad, your whole body will be full of darkness. If then the light that is in you is darkness, how great is the darkness!