כֹּ֣ה ׀ אָמַ֣ר יְהוָ֗ה אָר֤וּר הַגֶּ֙בֶר֙ אֲשֶׁ֣ר יִבְטַ֣ח בָּֽאָדָ֔ם וְשָׂ֥ם בָּשָׂ֖ר זְרֹע֑וֹ וּמִן־יְהוָ֖ה יָס֥וּר לִבּֽוֹ׃
Thus saith the LORD: Cursed is the man that trusteth in man, And maketh flesh his arm, And whose heart departeth from the LORD.
Read halakhic rulings (Jewish law) on Jeremiah 17:5: and classical halakhic sources.