Levitico 23:35

³⁵ Il primo giorno vi sarà una santa convocazione; non farete alcuna opera servile.

Leaven

'Leaven' signifies evil and falsity which should not be mixed with good and true things.

¹¹ "'No meal offering, which you shall offer to Yahweh, shall be made with yeast; for you shall burn no yeast, nor any honey, as an offering made by fire to Yahweh.