Commentaries:
Jamieson, Fausset, and Brown
The special reason is stated by Moses (Numbers 13:32-33; Numbers 14:4) to be that they, through fear arising from the false report of the spies, wished to return to Egypt; the general reasons are stated here which lay at the root of their rejection of God's grace; namely, contempt of God and His laws, and love of idols.
their heart—The fault lay in it (Psalms 78:37).
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