Hadith 140

Bulugh al-Maram

Book 2: The Book of Prayer
وَلِابْنِ مَاجَهْ بِإِسْنَادِ مُسْلِمٍ : { حَتَّى تَطْمَئِنَّ قَائِمًا } 1‏
The narration of Ibn Majah through a chain of Muslim has:

"Then rise up and stand erect calmly."