Hebrews 10:23

and washed as to our body with purifying water: let us hold fast the testimony of hope steadfast; for the one having promised is faithful;

1 Corinthians 1:9

God is faithful, through whom you have been called unto the fellowship of His Son our Lord Jesus Christ.

Hebrews 3:6

but Christ was as a son, over his own house; whose house we are, if we hold fast the boldness and rejoicing of hope firm unto the end.

Hebrews 11:11

And by faith Sarah herself received power unto the conception of seed, even past the time of age, since she considered him faithful who had promised.

1 Corinthians 10:13

No temptation has overtaken you, except that which is human: but God is faithful, who will not suffer you to be tempted above what you are able, but with the temptation, He will also make a way of escape, in order that you may be able to bear it.

Hebrews 4:14

Therefore having a great high priest, having entered into the heavens, Jesus the Son of God, let us hold fast the testimony.

1 Thessalonians 5:24

Faithful is the one calling you, who indeed will do it.

2 Thessalonians 3:3

But the Lord is faithful, who will establish you and keep you from the evil one.

Titus 1:2

in the hope of eternal life, which God who cannot lie, promised before the eternal times,

Hebrews 3:14

for we have been made partakers of Christ, if indeed we may hold fast the beginning of confidence firm unto the end.

Hebrews 6:18

that through two immutable things in which it was impossible that God should lie, we who have fled may have a strong consolation to lay hold of the hope set before us,

James 1:6

But let him ask in faith, doubting as to nothing; for he that doubts is like unto a wave of the sea driven by the winds and tossed by the tempest.

Revelation 3:11

I am coming quickly: hold fast that which you have, that no one may take your crown.

Treasury of Scripture Knowledge

Summary

Let us hold fast the profession of our faith without wavering; (for he is faithful that promised;)

Wavering

General references

Bible References

Wavering

James 1:6
But let him ask in faith, doubting as to nothing; for he that doubts is like unto a wave of the sea driven by the winds and tossed by the tempest.

For

Hebrews 6:18
that through two immutable things in which it was impossible that God should lie, we who have fled may have a strong consolation to lay hold of the hope set before us,
Hebrews 11:11
And by faith Sarah herself received power unto the conception of seed, even past the time of age, since she considered him faithful who had promised.
1 Corinthians 1:9
God is faithful, through whom you have been called unto the fellowship of His Son our Lord Jesus Christ.
1 Corinthians 10:13
No temptation has overtaken you, except that which is human: but God is faithful, who will not suffer you to be tempted above what you are able, but with the temptation, He will also make a way of escape, in order that you may be able to bear it.
1 Thessalonians 5:24
Faithful is the one calling you, who indeed will do it.
2 Thessalonians 3:3
But the Lord is faithful, who will establish you and keep you from the evil one.
Titus 1:2
in the hope of eternal life, which God who cannot lie, promised before the eternal times,

General references

Mark 15:38
And the veil of the temple was rent in twain from top even to the bottom.