From H2314 (chadar, 'to surround/enclose'). Cheder denotes the most interior, private room of a dwelling β the bedroom, the innermost chamber. It is used both literally for private rooms and figuratively for the hidden recesses of the heart.
Cheder appears in Proverbs and wisdom literature as a metaphor for hiddenness and privacy. 'Stolen waters are sweet, and bread eaten in secret is pleasant' (Prov. 9:17) β the adulteress beckons to the cheder. Ecclesiastes warns that even in your bedroom, do not curse the king β God hears all. Joel summons the bridegroom out of his cheder for battle. The word points to the reality that nothing is truly hidden from God. Jesus echoed this in Matthew 6 β pray in your private room, for your Father who sees in secret will reward you. The Christian life has an inner room that only God sees.