With the merciful
chaciyd  (khaw-seed')
kind, i.e. (religiously) pious (a saint) -- godly (man), good, holy (one), merciful, saint, (un-)godly.

---

thou wilt shew thyself merciful
chacad  (khaw-sad')
perhaps to bow (the neck only in courtesy to an equal), i.e. to be kind

---

and with the upright
tamiym  (taw-meem')
without blemish, complete, full, perfect, sincerely (-ity), sound, without spot, undefiled, upright(-ly), whole.

---

man
gibbowr  (ghib-bore')
powerful; by implication, warrior, tyrant -- champion, chief, excel, giant, man, mighty (man, one), strong (man), valiant man.

---

thou wilt shew thyself upright
tamam  (taw-mam')
to complete, in a good or a bad sense, literal, or figurative, transitive or intransitive (as follows)New American Standard Bible
"With the kind You show Yourself kind, With the blameless You show Yourself blameless;

King James Bible
With the merciful thou wilt shew thyself merciful, and with the upright man thou wilt shew thyself upright.

Holman Christian Standard Bible
With the faithful You prove Yourself faithful; with the blameless man You prove Yourself blameless;

International Standard Version
In the company of the gracious you demonstrate your gracious love. In the company of the blamelessly valiant you demonstrate your blamelessness.

NET Bible
You prove to be loyal to one who is faithful; you prove to be trustworthy to one who is innocent.

GOD'S WORD® Translation
[In dealing] with faithful people you are faithful, with innocent warriors you are innocent,

King James 2000 Bible
With the merciful you will show yourself merciful, and with the upright man you will show yourself upright.2 Samuel 22:26
2 Samuel 22:26 NIV
2 Samuel 22:26 NLT
2 Samuel 22:26 ESV
2 Samuel 22:26 NASB
2 Samuel 22:26 KJV