Matthew 10:6

but go rather to the lost sheep of the house of Israel;

Matthew 15:24

But he answered and said, I am not sent, except to the lost sheep of the house of Israel.

Matthew 18:12-13

What think you? If a man has a hundred sheep, and one of them is lost, does he not leave the ninety-nine on the mountain, and go and seek for the lost one?

Luke 15:4-7

What man of you having a hundred sheep, and losing one of them, does not leave the ninety-nine in the wilderness, and go after the lost sheep till he finds it.

Luke 19:10

for the Son of man has come to seek and save the lost.

John 10:16

And other sheep I have which are not of this fold; and them I must lead, and they shall hear my voice, and there shall be one flock, one shepherd.

Galatians 4:9

but now knowing God, or rather being known by God, how do you turn again to the weak and imperfect rudiments, which you wish again to serve?

Philippians 2:13

for God works in you both to will and to work of his good pleasure.

James 1:17

All good giving, and every perfect gift, comes down from above, from the Father of lights, with whom there is no change or shadow of turning.

1 Peter 2:25

For you were like lost sheep, but are now returned to the shepherd and bishop of your souls.

Treasury of Scripture Knowledge

Summary

I have gone astray like a lost sheep; seek thy servant; for I do not forget thy commandments.

Bible References

Gone astray

Matthew 10:6
but go rather to the lost sheep of the house of Israel;
Matthew 15:24
But he answered and said, I am not sent, except to the lost sheep of the house of Israel.
Matthew 18:12
What think you? If a man has a hundred sheep, and one of them is lost, does he not leave the ninety-nine on the mountain, and go and seek for the lost one?
Luke 15:4
What man of you having a hundred sheep, and losing one of them, does not leave the ninety-nine in the wilderness, and go after the lost sheep till he finds it.
John 10:16
And other sheep I have which are not of this fold; and them I must lead, and they shall hear my voice, and there shall be one flock, one shepherd.
1 Peter 2:25
For you were like lost sheep, but are now returned to the shepherd and bishop of your souls.

Seek

Luke 19:10
for the Son of man has come to seek and save the lost.
Galatians 4:9
but now knowing God, or rather being known by God, how do you turn again to the weak and imperfect rudiments, which you wish again to serve?
Philippians 2:13
for God works in you both to will and to work of his good pleasure.
James 1:17
All good giving, and every perfect gift, comes down from above, from the Father of lights, with whom there is no change or shadow of turning.