What does the Bible say About Perseverance:

Mark 13:13
And ye shall be hated of all men for my name's sake: but he that shall endure unto the end, the same shall be saved.

Romans 2:7
To them who by patient continuance in well doing seek for glory and honour and immortality, eternal life :

Romans 4:16
Therefore it is of faith, that it might be by grace; to the end the promise might be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham; who is the father of us all,

1 Corinthians 9:24
Know ye not that they which run in a race run all, but one receiveth the prize? So run, that ye may obtain.

1 Corinthians 15:58
Therefore, my beloved brethren, be ye stedfast, unmoveable, always abounding in the work of the Lord, forasmuch as ye know that your labour is not in vain in the Lord.

Philemon 3:13-14
(13) Brethren, I count not myself to have apprehended: but this one thing I do, forgetting those things which are behind, and reaching forth unto those things which are before,
(14) I press toward the mark for the prize of the high calling of God in Christ Jesus.

1 Timothy 4:16
Take heed unto thyself, and unto the doctrine; continue in them: for in doing this thou shalt both save thyself, and them that hear thee.

1 Timothy 6:19-21
(19) Laying up in store for themselves a good foundation against the time to come, that they may lay hold on eternal life.
(20) O Timothy, keep that which is committed to thy trust, avoiding profane and vain babblings, and oppositions of science falsely so called:
(21) Which some professing have erred concerning the faith. Grace be with thee. Amen.

2 Timothy 4:6-8
(6) For I am now ready to be offered, and the time of my departure is at hand.
(7) I have fought a good fight, I have finished my course, I have kept the faith:
(8) Henceforth there is laid up for me a crown of righteousness, which the Lord, the righteous judge, shall give me at that day: and not to me only, but unto all them also that love his appearing.

Galatians 6:7-9
(7) Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap.
(8) For he that soweth to his flesh shall of the flesh reap corruption; but he that soweth to the Spirit shall of the Spirit reap life everlasting.
(9) And let us not be weary in well doing: for in due season we shall reap, if we faint not.

1 Peter 1:13
Wherefore gird up the loins of your mind, be sober, and hope to the end for the grace that is to be brought unto you at the revelation of Jesus Christ;

Hebrews 3:6
But Christ as a son over his own house; whose house are we, if we hold fast the confidence and the rejoicing of the hope firm unto the end.

Hebrews 3:14
For we are made partakers of Christ, if we hold the beginning of our confidence stedfast unto the end;

Hebrews 10:36
For ye have need of patience, that, after ye have done the will of God, ye might receive the promise.

1 John 2:17
And the world passeth away, and the lust thereof: but he that doeth the will of God abideth for ever.

1 John 2:24-25
(24) Let that therefore abide in you, which ye have heard from the beginning. If that which ye have heard from the beginning shall remain in you, ye also shall continue in the Son, and in the Father.
(25) And this is the promise that he hath promised us, even eternal life.

Revelation 2:10-11
(10) Fear none of those things which thou shalt suffer: behold, the devil shall cast some of you into prison, that ye may be tried; and ye shall have tribulation ten days: be thou faithful unto death, and I will give thee a crown of life.
(11) He that hath an ear, let him hear what the Spirit saith unto the churches; He that overcometh shall not be hurt of the second death.

Revelation 2:26
And he that overcometh, and keepeth my works unto the end, to him will I give power over the nations:

Revelation 3:5
He that overcometh, the same shall be clothed in white raiment; and I will not blot out his name out of the book of life, but I will confess his name before my Father, and before his angels.