Where our journey starts Parashat Tzav repeats and enlarges upon the descriptions of the sacrifices already discussed in parashat Vayikra. If he shall offer it as thanksgiving . Let them praise the Lord for his steadfast love, and for his wonderful works to the children of men, and let them sacrifice the sacrifice of thanksgiving. Language searches for different forms in which to express different nuances. In the singular, shalom expresses prosperity and well being.
Troubles afflict the soul and once the soul is delivered from trouble and suffering, it is at peace.
The peace offering reflects an abundance of joy, gratitude to God for one s well-being or for deliverance from trouble. By thanking God for His goodness, he brings on himself Divine Grace that ensures his welfare. The most plausible of all is the view of our Sages that shelamim shares its root with shalom , peace, or shalem perfect. This may reflect the contentment of the worshipper who recognizes that this is the result of his cleaving to God, and acknowledges this from despair and long for Divine succour to keep him intact. This he expresses through the shelamim, whereby he declares that his own peace and well being are inextricably bound up with cleaving to God.