Explanatory Notes on the Whole Bible, by John Wesley, [1754-65], at sacred-texts.com
psa 121:1Hills - To Sion and Moriah, which are called the holy mountains.
psa 121:5Shade - To keep thee from the burning heat of the sun.
psa 121:6Smite - With excessive heat. Moon - With that cold and moisture which come into the air by it. Intemperate heats and colds are the springs of many diseases.