حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ عَبْدِ الْكَرِيمِ بْنِ أَبِي الْمُخَارِقِ الْبَصْرِيِّ، أَنَّهُ قَالَ مِنْ كَلاَمِ النُّبُوَّةِ إِذَا لَمْ تَسْتَحِي فَافْعَلْ مَا شِئْتَ وَوَضْعُ الْيَدَيْنِ إِحْدَاهُمَا عَلَى الأُخْرَى فِي الصَّلاَةِ يَضَعُ الْيُمْنَى عَلَى الْيُسْرَى وَتَعْجِيلُ الْفِطْرِ وَالاِسْتِينَاءُ بِالسَّحُورِ ‏.‏

Yahya related to me from Malik that Abd al-Karim ibnAbi'l-Mukhariq al-Basri said, "Among things the Prophet, may Allahbless him and grant him peace, said and did are: 'As long as you donot feel ashamed, do whatever you wish', the placing of one hand onthe other in prayer (one places the right hand on the left), beingquick to break the fast, and delaying the meal before dawn." Translation Not Available

Book Ref: Muwatta Imam Malik Book 9 Hadith 380
Web Ref:  Muwatta Imam Malik Book 9 Hadith 49