عَنِ ابْنِ مَسْعُودٍ رَضِيَ اللّهُ عَنْهُ: أَنَّهُ أُتِيَ فَقِيلَ لَهُ: هَذَا فُلانٌ تَقْطُرُ لِحْيَتُهُ خَمْرًا، فَقَالَ: إِنَّا قَدْ نُهِيْنَا عَنِ التَّجَسُّسِ، وَلَكِنْ إِنْ يَظْهَرْ لَنَا شَيْءٌ نَأْخُذ بِهِ. حَدِيثٌ حَسَنٌ صحيحٌ، رَوَاهُ أَبُو دَاوُودَ بِإِسْنَادٍ عَلَى شَرْطِ الْبُخَارِيِّ وَمُسْلِمٍ.

Ibn Mas'ud (may Allah be pleased with him) reported: He was approached and it was said to him: "This is so-and-so, whose beard drips with wine." He said: "We have been forbidden from spying, but if something becomes apparent to us, we will take him to task for it." A hasan sahih hadith, reported by Abu Dawud with a chain meeting the conditions of al-Bukhari and Muslim.