shalom shalom

Isaiah 26:3 "The man whose heart is unmoved you will keep in peace, because his hope is in you." (BBE)
"You will keep [him] in perfect shalom, [whose] mind [is] stayed [on you]; because he trusts in you." (HNV)

Perfect peace is shalom shalom in Hebrew.

The Strong's concordance defines Shalom as completeness, soundness, welfare, peace:

• completeness (in number)
• safety, soundness (in body)
• welfare, health, prosperity
• peace, quiet, tranquillity, contentment
• peace, friendship of human relationships, and/or with God especially in covenant relationship
• peace (from war)
• peace (as adjective)