Say, "Whoever is in error - let the Most Merciful extend for him an extension [in wealth and time] until, when they see that which they were promised - either punishment [in this world] or the Hour [of resurrection] - they will come to know who is worst in position and weaker in soldiers."
Say - O Messenger: The Merciful will grant respite to those wallowing in their misguidance, so that they fall further into it, until when they see what they have been warned about- either the swift punishment in this world or the punishment postponed to the Day of Judgment - then they will realise who is worse situated and who has the weakest forces. Is it their party or the party of the believers.