Muwatta Malik
Book 15, Hadith 39
Arabic hadith text
حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، قَالَ رَآنِي عَبْدُ اللَّهِ بْنُ عُمَرَ وَأَنَا أَدْعُو، وَأُشِيرُ، بِأَصْبُعَيْنِ أَصْبُعٍ مِنْ كُلِّ يَدٍ فَنَهَانِي .
Translation
Yahya related to me from Malik that Abdullah ibn Dinar said,"Abdullah ibn Umar saw me when I was making dua and I was pointingwith two fingers, one from each hand, and he forbade me."