Reference for Lamentations 3:44

סַכּ֤וֹתָה בֶֽעָנָן֙ לָ֔ךְ מֵעֲב֖וֹר תְּפִלָּֽה׃

Thou hast covered Thyself with a cloud, So that no prayer can pass through.

BDB

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The Jewish Spiritual Heroes