C. F. Keil and Franz Delitzsch on Joshua 24:19-20

Jos 24:19-20

But in order to place most vividly before the minds of the people to what it was that they bound themselves by this declaration, that they might not inconsiderately vow what they would not afterwards observe, Joshua adds, “Ye cannot serve Jehovah,” sc., in the state of mind in which ye are at present, or “by your own resolution only, and without the assistance of divine grace, without solid and serious conversion from all idols, and without true repentance and faith” (J. H. Michaelis). For Jehovah is “a holy God,” etc. Elohim, used to denote the Supreme Being (see at Gen 2:4), is construed with the predicate in the plural. On the holiness of God, see the exposition of Exo 19:6. On the expression “a jealous God,” see Exo 20:5; and on לפשׁע נשׂא, Exo 23:21. The only other place in which the form קנּוא is used for קנּא is Nah 1:2. “If ye forsake the Lord and serve strange gods, He will turn (i.e., assume a different attitude towards you) and do you hurt, after He has done you good,” i.e., He will not spare you, in spite of the blessings which He has conferred upon you. חרע is used to denote the judgments threatened in the law against transgressors.