מִבִּלְתִּ֞י יְכֹ֣לֶת יְהוָ֗ה לְהָבִיא֙ אֶת־הָעָ֣ם הַזֶּ֔ה אֶל־הָאָ֖רֶץ אֲשֶׁר־נִשְׁבַּ֣ע לָהֶ֑ם וַיִּשְׁחָטֵ֖ם בַּמִּדְבָּֽר׃
Because the LORD was not able to bring this people into the land which He swore unto them, therefore He hath slain them in the wilderness.
Read kabbalistic (mystical) interpretation of Numbers 14:16: and classical mystical sources.