Matthew 24:15

When ye therefore shall see the abomination of desolation, spoken of by Daniel the prophet, stand in the holy place, (whoso readeth, let him understand:)

"When, therefore, you see the abomination of desolation, which was spoken of through Daniel the prophet, standing in the holy place (let the reader understand),

When therefore ye see the abomination of desolation, which was spoken of through Daniel the prophet, standing in the holy place (let him that readeth understand),

`Whenever, therefore, ye may see the abomination of the desolation, that was spoken of through Daniel the prophet, standing in the holy place (whoever is reading let him observe)

So when you see standing in the holy place ‘the abomination of desolation,’ described by the prophet Daniel (let the reader understand),