the keeper of the gate is the Holy One of Israel 2 Nephi 9:41

2 Nephi 9:41

O then, my beloved brethren, come unto the Lord, the Holy One. Remember that his paths are righteous. Behold, the way for man is narrow, but it lieth in a straight course before him, and the keeper of the gate is the Holy One of Israel; and he employeth no servant there; and there is none other way save it be by the gate; for he cannot be deceived, for the Lord God is his name.
2 Nephi 9:41

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Photo by Jonas Jacobsson

Then are ye in this strait and narrow path which leads to eternal life - 2 Nephi 31:18

2 Nephi 31:18

And then are ye in this strait and narrow path which leads to eternal life; yea, ye have entered in by the gate; ye have done according to the commandments of the Father and the Son; and ye have received the Holy Ghost, which witnesses of the Father and the Son, unto the fulfilling of the promise which he hath made, that if ye entered in by the way ye should receive.
2 Nephi 31:18

Read in scriptures: http://bit.ly/2saoIn9