Matthew 23:11

But the greatest among you will be your servant.

Galatians 5:13

For you, my brothers, were called to freedom; only do not let your freedom become an opportunity for the sinful nature (worldliness, selfishness), but through love serve and seek the best for one another.

Matthew 20:26-27

It is not this way among you, but whoever wishes to become great among you shall be your servant,

Mark 10:43-44

But this is not how it is among you; instead, whoever wishes to become great among you must be your servant,

Luke 22:26-27

But it is not to be this way with you; on the contrary, the one who is the greatest among you must become like the youngest [and least privileged], and the [one who is the] leader, like the servant.

John 13:14-15

So if I, the Lord and the Teacher, washed your feet, you ought to wash one another’s feet as well.

1 Corinthians 9:19

For though I am free from all men, I have made myself a slave to everyone, so that I may win more [for Christ].

2 Corinthians 4:5

For we do not preach ourselves, but Jesus Christ as Lord, and ourselves [merely] as your bond-servants for Jesus’ sake.

2 Corinthians 11:23

Are they [self-proclaimed] servants of Christ?—I am speaking as if I were out of my mind—I am more so [for I exceed them]; with far more labors, with far more imprisonments, beaten times without number, and often in danger of death.

Philippians 2:5-8

Have this same attitude in yourselves which was in Christ Jesus [look to Him as your example in selfless humility],

Treasury of Scripture Knowledge

Summary

But he that is greatest among you shall be your servant.

Bible References

General references

Matthew 20:26
It is not this way among you, but whoever wishes to become great among you shall be your servant,
Mark 10:43
But this is not how it is among you; instead, whoever wishes to become great among you must be your servant,
Luke 22:26
But it is not to be this way with you; on the contrary, the one who is the greatest among you must become like the youngest [and least privileged], and the [one who is the] leader, like the servant.
John 13:14
So if I, the Lord and the Teacher, washed your feet, you ought to wash one another’s feet as well.
1 Corinthians 9:19
For though I am free from all men, I have made myself a slave to everyone, so that I may win more [for Christ].
2 Corinthians 4:5
For we do not preach ourselves, but Jesus Christ as Lord, and ourselves [merely] as your bond-servants for Jesus’ sake.
2 Corinthians 11:23
Are they [self-proclaimed] servants of Christ?—I am speaking as if I were out of my mind—I am more so [for I exceed them]; with far more labors, with far more imprisonments, beaten times without number, and often in danger of death.
Galatians 5:13
For you, my brothers, were called to freedom; only do not let your freedom become an opportunity for the sinful nature (worldliness, selfishness), but through love serve and seek the best for one another.
Philippians 2:5
Have this same attitude in yourselves which was in Christ Jesus [look to Him as your example in selfless humility],