Hadith 2:385
Narrated Jabir (RA):
It is decided in the Sunnah that the Friday prayer (established/recognized) when forty praying persons or more attend it. [ad-Daraqutni reported it through a weak chain of narrators].
وَعَنْ جَابِرٍ - رضى الله عنه - قَالَ: { مَضَتِ السُّنَّةُ أَنَّ فِي كُلِّ أَرْبَعِينَ فَصَاعِدًا جُمُعَةً } رَوَاهُ اَلدَّارَقُطْنِيُّ بِإِسْنَادٍ ضَعِيف ٍ