Psalms 78:22 Kabbalah

כִּ֤י לֹ֣א הֶ֭אֱמִינוּ בֵּאלֹהִ֑ים וְלֹ֥א בָ֝טְח֗וּ בִּֽישׁוּעָתֽוֹ׃

Because they believed not in God, And trusted not in His salvation.

Read kabbalistic (mystical) interpretation of Psalms 78:22: and classical mystical sources.