21 And they digged another well, and strove for that also: and he called the name of it Sitnah. 
21 Then they dug another well, but they quarreled over that one also; so he named it Sitnah.
21 Then they dug another well, and they quarreled over that also, so he called its name Sitnah.
21 They dug another well and there was a difference over that one also, so he named it Sitnah (Accusation).
21 Then they dug another well, and they quarreled over that one also. So he called its name Sitnah.
21 Isaac's men then dug another well, but again there was a dispute over it. So Isaac named it Sitnah (which means "hostility").
Matthew Henry's Commentary on Genesis 26:21
Commentary on Genesis 26:18-25
(Read Genesis 26:18-25)
Isaac met with much opposition in digging wells. Two were called Contention and Hatred. See the nature of worldly things; they make quarrels, and are occasions of strife; and what is often the lot of the most quiet and peaceable; those who avoid striving, yet cannot avoid being striven with. And what a mercy it is to have plenty of water; to have it without striving for it! The more common this mercy is, the more reason to be thankful for it. At length Isaac digged a well, for which they strove not. Those that study to be quiet, seldom fail of being so. When men are false and unkind, still God is faithful and gracious; and his time to show himself so is, when we are most disappointed by men. The same night that Isaac came weary and uneasy to Beer-sheba, God brought comforts to his soul. Those may remove with comfort who are sure of God's presence.