Boyd’s Bible Dictionary:

(through). [GATE.]

Concise Bible Dictionary:

Besides the common use of the door as the means of entrance into a house, and of enclosing those within when shut, it is used in scripture symbolically for the way of entrance into blessing. The Lord said, “I am the door: by me if any man enter in, he shall be saved.” Salvation is only by Him. He also said that as the true Shepherd He entered into the sheepfold by the door, that is, though Son of God, He entered as obedient by God’s appointed means, being circumcised, presented in the temple, and baptized (John 10:1-91Verily, verily, I say unto you, He that entereth not by the door into the sheepfold, but climbeth up some other way, the same is a thief and a robber. 2But he that entereth in by the door is the shepherd of the sheep. 3To him the porter openeth; and the sheep hear his voice: and he calleth his own sheep by name, and leadeth them out. 4And when he putteth forth his own sheep, he goeth before them, and the sheep follow him: for they know his voice. 5And a stranger will they not follow, but will flee from him: for they know not the voice of strangers. 6This parable spake Jesus unto them: but they understood not what things they were which he spake unto them. 7Then said Jesus unto them again, Verily, verily, I say unto you, I am the door of the sheep. 8All that ever came before me are thieves and robbers: but the sheep did not hear them. 9I am the door: by me if any man enter in, he shall be saved, and shall go in and out, and find pasture. (John 10:1‑9)). God opened “the door of faith” to the Gentiles by Paul and Barnabas (Acts 14:2727And when they were come, and had gathered the church together, they rehearsed all that God had done with them, and how he had opened the door of faith unto the Gentiles. (Acts 14:27)). Opportunities for service are called opened doors (1 Cor. 16:99For a great door and effectual is opened unto me, and there are many adversaries. (1 Corinthians 16:9); 2 Cor. 2:1212Furthermore, when I came to Troas to preach Christ's gospel, and a door was opened unto me of the Lord, (2 Corinthians 2:12); Col. 4:33Withal praying also for us, that God would open unto us a door of utterance, to speak the mystery of Christ, for which I am also in bonds: (Colossians 4:3); Rev. 3:88I know thy works: behold, I have set before thee an open door, and no man can shut it: for thou hast a little strength, and hast kept my word, and hast not denied my name. (Revelation 3:8)).
When the church is represented as in a Laodicean state the Lord is outside knocking for admission at the door of the assembly, so that the individual may hear, with a promise of blessing to those who open to Him (Rev. 3:2020Behold, I stand at the door, and knock: if any man hear my voice, and open the door, I will come in to him, and will sup with him, and he with me. (Revelation 3:20)).
Doors in the East are usually made of wood; but in the deserted cities of Bashan doors are found cut out of stone, with a projection top and bottom which served as pivots on which the door turned.

From Manners and Customs of the Bible:

In the open country where the houses are exposed to the depredations of wandering Arabs the gates are made very low, so as to prevent the marauders from riding through the porch into the court. A high gate would be an invitation to enter. Even in cities the gates of houses are often made low and unattractive in appearance, affording no indication of the wealth which may be within, lest the cupidity of wicked rulers should be attracted. Travelers speak of house-gates as low as three feet from the ground. In Persia a lofty gate is one of the signs of royalty, which some of the subjects, in their vanity, imitate as far as they dare.
Anderson says: “The house in which I dwelt in Jerusalem had an arch, or gateway, a few yards from the door, which was so low that a person on horseback could not pass under it. It was evidently built for the sake of security” (Bible Light from Bible Lands, p. 329).
The meaning of the text undoubtedly is, He who has a high gate to his house invites the robber by a show of prosperity and by affording facility of entrance. He thus “seeketh destruction.”

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