عَنْ عَائِشَةَ زَوْجِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَنَّهُ قَالَ: ((فَضْلُ الصَّلَاةِ بِالسِّوَاكِ عَلَى الصَّلَاةِ بِغَيْرِ السِّوَاكِ سَبْعِينَ ضِعْفًا))
It is narrated from Sayyidah Aisha (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: "The virtue of the prayer performed with miswak is seventy times greater than the prayer performed without miswak."