The second person pronouns in verses 21-23 are all plural.
May you be blessed by the LORD: see the comments on 15.13. The passive formulation may easily be made active by saying “May the LORD bless you,” as in Good News Translation.
For: the transition word shows the relationship between the kindness of the people from Ziph and Saul’s desire to ask God’s blessing on them. Some languages may prefer to reverse the order of the two main elements in this verse, saying “You people have been very kind to me, so I ask that the LORD will bless you.”
The verb here rendered had compassion on is translated earlier in 1 Samuel by the English verb “to spare” (15.3, 9, 15) and carries the meaning “to be merciful toward” or “show kindness to.” Contemporary English Version translates “You’ve done me a big favor.”
Quoted with permission from Omanson, Roger L. and Ellington, John E. A Handbook on the First and Second Books of Samuel, Volume 1. (UBS Helps for Translators). New York: UBS, 2001. For this and other handbooks for translators see here .
