The Ruling on Selling One Commodity for a Different Commodity

The questioner: And the one who deals in riba (usury or interest) in a manner that is open, like this one we are discussing, he says to you, "Why are we keeping our money idle?" And this is true, and the first party is also keeping his money idle, but this is not an excuse for committing what Allah has forbidden. We exchange dates for dates, silver for silver, wheat for wheat, salt for salt, wheat for wheat, wheat for wheat, as if it were yesterday. My cousin's son reminds me of a case I knew of previously, which I may have forgotten now, that this was money in a house, money in a house, and the commodity differed, so it seems to me that I remember that Shaykh 'Abd al-'Aziz ibn Baz or Imam al-Shafi'i (may Allah have mercy on him) permitted that due to the difference in the commodity. So I wanted to clarify this with you.

The Shaykh: In the difference of speed