At-Tawbah 9:108

La taqum feehi abadan lamasjidunossisa AAala attaqwa min awwali yawmin ahaqquan taqooma feehi feehi rijalun yuhibboona an yatatahharoowallahu yuhibbu almuttahhireen

Do not stand [for prayer] within it - ever. A mosque founded on righteousness from the first day is more worthy for you to stand in. Within it are men who love to purify themselves; and Allāh loves those who purify themselves.

Do not ever stand there (in prayer). In fact, the mosque that was founded on Taqwā (piety) from the very first day has greater right that you stand in it. In it there are people who like to observe purity; and Allah loves those observing purity.