[Machine] The Prophet ﷺ used to say this, but he did not say it in the prayer.
أَنَّ النَّبِيَّ ﷺ كَانَ يَقُولُ ذَلِكَ وَلَمْ يَقُلْ فِي الصَّلَاةِ
The Prophet ﷺ used to make a sign during prayer. (Using translation from Abū Dāʾūd 943)
أَنَّ النَّبِيَّ ﷺ كَانَ يُشِيرُ فِي الصَّلَاةِ