Of their welfare, Heb. of their peace, i.e. prosperity and all happiness, which also they wished one to the other, as this phrase implies. See 1 Samuel 10:4 Psalms 122:6.
Related Commentaries of Exodus 18:7
Exodus 18:7
7 And Moses went out to meet his father in law, and did obeisance, and kissed him; and they asked each other of their welfare;c and they came into the tent.