Sefer Chasidim Siman 856
Can copy this into an AI, or connect the whole library to your assistant. For deeper learning, you can directly use the original seforim, sites, and apps.
אל יניח אדם מפתח קשור באזורו ביום ששי פן ישכחנו ברשותו בשבת וישאנו עליו ולא יניח מעות בחלוקו פן ישכחם וישאם:
Medieval Jewish mysticism, translated by Sholom Alchanan Singer. Northbrook, Ill. Whitehall Co., 1971
One should not leave a key attached to his belt on Friday lest he forget it there and will come to carry it, also no money should be left in one's garment for the same reason.