The King James Bible addresses serving others in several passages:
Mark 10:43-45 (KJV)
43 But so shall it not be among you: but whosoever will be great among you, shall be your minister: 44 And whosoever of you will be the chiefest, shall be servant of all. 45 For even the Son of man came not to be ministered unto, but to minister, and to give his life a ransom for many.
Galatians 5:13-14 (KJV)
13 For, brethren, ye have been called unto liberty; only use not liberty for an occasion to the flesh, but by love serve one another. 14 For all the law is fulfilled in one word, even in this; Thou shalt love thy neighbour as thyself.
1 Peter 4:10 (KJV)
10 As every man hath received the gift, even so minister the same one to another, as good stewards of the manifold grace of God.
Matthew 25:40 (KJV)
40 And the King shall answer and say unto them, Verily I say unto you, Inasmuch as ye have done it unto one of the least of these my brethren, ye have done it unto me.
Philippians 2:3-4 (KJV)
3 Let nothing be done through strife or vainglory; but in lowliness of mind let each esteem other better than themselves. 4 Look not every man on his own things, but every man also on the things of others.