The Sourdough Starter is based on Matthew 13: 33
The original parable is only one verse long; this isn’t so much a retelling as an expansion.
Breadmaking
Nowadays, it’s a bit of a judgement call whether people will be familiar with breadmaking. The advantage of factory baked bread is that it makes a staple part of the diet cheap and readily available. A disadvantage is that it’s now possible to not have a clue how to make bread.
Jesus, however, could assume his audience would all be able to fill in the gaps. They’d know that the woman would need to add water to the flour/yeast mix. Then, they’d know that once the yeast was working through, the bread would rise. They’d also realise that only the risen dough would be baked into bread and just how much bread ‘three measures of flour’ would make (a lot). Even if they’d never personally baked a loaf of bread in their lives, they’d have seen it being done.
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