once
ويَقُومُ يُصَلِّي إِنْ أَرَادَ ذَلِكَ
Meaning
Get up and pray if you so desire.
Source and references
Hisn al-Muslim, entry 115.The reference is copied from the edition; separate editorial verification is not complete yet.
Source edition: Fortress of the Muslim. Open source ↗