23:29a as well as for the rows of the showbread,

They took care of the special bread for the table in the holy place. (EEB)
-or-
They were responsible for the special bread that the priests put on the table in the holy place.

23:29b the fine flour for the grain offering, the wafers of unleavened bread,

They kept the flour for the grain offerings and for the flat bread that they made without yeast.
-or-
They kept the good flour for the grain offering, and for the bread that they made without yeast. (Easy English Bible)

23:29c the baking, the mixing, and all measurements of quantity and size.

They weighed and they measured all the things for baking the bread and the cakes.
-or-
They mixed the dough for the bread used for sacrifices and they baked it. And they weighed everything and they measured everything.

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