ENOfficial
Ibn ‘Umar said God’s Messenger forbade that a man should sit during prayer leaning on his hand. Ahmad and Abu Dawud transmitted it, and in a version by Abu Dawud it says he forbade that a man should lean on his hands when he got up during the prayer.
Source: sunnah.com
Other translations
Arabic
وَعَنِ ابْنِ عُمَرَ قَالَ: نَهَى رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَنْ يَجْلِسَ الرَّجُلُ فِي الصَّلَاةِ وَهُوَ مُعْتَمِدٌ عَلَى يَدِهِ. رَوَاهُ أَحْمد وَأَبُو دَاوُد وَفِي رِوَايَةٍ لَهُ: نَهَى أَنْ يَعْتَمِدَ الرَّجُلُ عَلَى يَدَيْهِ إِذا نَهَضَ فِي الصَّلَاة
sunnah.com