זוהר ויקרא — דף כט ע”א

Thus smoke is aroused from Binah, which is in the heart — "the heart understands" — and rises to Wisdom, which is like the brain; and what is the smoke? This is the middle pillar, Da'at — "a heart that understands knowledge." After the smoke descends, Chochmah to Binah — one to the left, one to the right — it descends full from Abba and Imma, full of Yod-Heh, to burn the logs which are the disciples of the sages, from the side of the Tree of Life — the limbs of the body — in the flames of the Torah, of which it is said "Is not My word like fire?", in the flame of a commandment performed in love.<br />
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It is a commandment to offer the continual offerings every day, and afterward to light the fire — "a perpetual fire shall burn on the altar; it shall not go out" — and afterward the removal of the ashes, and afterward a vow or freewill offering. All these continual offerings are attributes of the Holy One, blessed be He, which require satisfaction; and although all the sefirot are one, each sefirah is appointed over sabbaths, appointed times, and festivals, and the attribute that rules at that time includes within it all the others.<br />
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There is a cessation of labor, like the ox that bears a yoke and the donkey that bears a burden: between the yoke of the kingdom of heaven (such as tefillin) and the yoke of the kingdom of idol-worshippers. One who does not occupy himself with Torah and commandments bears the yoke of the idol-worshippers; one who occupies himself with them bears the yoke of the kingdom of heaven. The yoke of the commandments is certainly real, for by it all the creatures of heaven and earth were created — "these are the generations of the heavens and the earth when they were created," created by the Heh; and when Shabbat or a festival comes, Binah descends upon Malchut as an additional soul, and spreads her wings over the Daughter and her camps, who then have rest. The sign of tefillin, the sign of Shabbat, the sign of festivals, and the sign of the covenant are all equal.<br />
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There is also the sign of Shaddai, who is Metatron the servant, upon whom many servants depend, appointed over those who perform commandments in order to receive a reward — of them it is said "that your ox and your donkey, your manservant and your maidservant may rest." But those who perform commandments not in order to receive a reward are the children of the King and the Queen, crowns and diadems upon the heads of the servants on weekdays. Therefore: whether as sons or as servants. As sons — "you are sons to the Lord your God"; as servants — "for the children of Israel are My servants," and not the other nations. But the wicked who do not occupy themselves with Torah and commandments, and who bear neither the yoke of Torah nor of tefillin, are servants to the nations of the world, like "we were slaves to Pharaoh."<br />
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And if they keep sabbaths and festivals, it is said of them "the Lord our God brought us out," and there is fulfilled in them "that your ox and your donkey may rest" — the donkey representing Torah and commandments, the common person being called an animal; and after he places himself under the authority of a Torah scholar, there is fulfilled in him "the Lord saves man and beast" — like a horse that carries its master without kicking. And what is the burden the common person bears for the Torah scholar? The Torah scholar is like the day of Shabbat, who possesses nothing of his own; and if the common person supports him with his wealth and conducts himself according to his will, there is fulfilled in him "the Lord saves man and beast" — He saves him from robbery, from plunder, and from the angel of death, so that he not be slaughtered with a blemished knife, for one slaughtered thus is carrion, "you shall throw it to the dog," which is Samael.