Leviticus 27:16

¹⁶ And if a man hallow to Jehovah [part] of a field of his possession, thy valuation shall be according to what may be sown in it: the homer of barley seed at fifty shekels of silver.

Siloam

'Siloam' signifies the letter of the Word, and 'to be washed' in it signifies being purified from falsities and evils.