Chasidut על אבות 6:8

It is well known that Shabbat corresponds to the final hay of God’s name, and that it is called, a daughter. And anyone that observes Shabbat ‘merits the inheritance of Yaakov’ – as is well known. And Yaakov is the vav of the name, and is also called, son – as is elucidated in several places. And that is the meaning of that which is sung, “One who keeps the Shabbat” – who merits to raise up the vav and the hay of the name – which is, “a boy and a girl – will be accepted like a meal offering on the griddle.” That is because it is only from the inanimate and from that which grows – which also only correspond to the vav and the hay of the name. Yet the Holy One, blessed be He, accepts it willingly. And in another place, I explained that this song has seven rhyming stanzas which hint to the seven characteristics (see Avot 6:8). ‘And knowledge comes easily to the intelligent man.’