As for what is narrated from Ibn Mas'ud (may Allah be pleased with him), that he said: "The unlawful and the lawful never come together without the unlawful prevailing over the lawful," only Jabir al-Ju'fi narrated it, from al-Sha'bi from Ibn Mas'ud. Jabir al-Ju'fi is da'if (weak), and al-Sha'bi from Ibn Mas'ud is munqati' (broken). Others narrated it, with its meaning, from al-Sha'bi as his own statement, not traced back to Abdullah bin Mas'ud.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13969