Hadith
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا حَمَّادٌ، عَنْ أَيُّوبَ، عَنْ حَفْصَةَ، عَنْ أُمِّ عَطِيَّةَ، نَحْوَهُ غَيْرَ أَنَّهُ قَالَ " ثَلاَثًا أَوْ خَمْسًا أَوْ سَبْعًا أَوْ أَكْثَرَ مِنْ ذَلِكِ إِنْ رَأَيْتُنَّ ذَلِكِ " .
Something similar was narrated from Umm 'Atiyyah except, that he (the narrator) said:"Three times or five, or seven, or more than that, if you think that (is necessary)
Sahih · Abu Ghuddah
Sunan an-Nasa'i 1888 ·Book 21, Hadith 71·Also available on sunnah.com·