عَنْ كَعْبِ بْنِ عُجْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: دَخَلَ عَلَيَّ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ الْمَسْجِدَ وَقَدْ شَبَّكْتُ بَيْنَ أَصَابِعِي، فَقَالَ لِي: ((يَا كَعْبُ! إِذَا كُنْتَ فِي الْمَسْجِدِ فَلَا تُشَبِّكْ بَيْنَ أَصَابِعِكَ فَأَنْتَ فِي صَلَاةٍ مَا انْتَظَرْتَ الصَّلَاةَ))
Sayyiduna Ka'b bin Ujrah (may Allah be pleased with him) says: The Messenger of Allah (peace and blessings be upon him) entered upon me in the mosque while I had interlaced my fingers. So he (peace and blessings be upon him) said to me: "Ka'b! When you are in the mosque, do not interlace your fingers, because as long as you remain waiting for the prayer, you are considered to be in prayer."