Musnad Ahmad

It is narrated from Sayyiduna Ibn Mas'ud (may Allah be pleased with him) that once I was clinging to the covering of the Ka'bah when three men came. One of them was a Qurayshi and two were from the tribe of Thaqif who were his sons-in-law, or one was from Thaqif and two were Qurayshi. Their bellies were large with fat but their hearts had very little understanding. They began to talk quietly among themselves, which I could not hear. Then one of them said: What do you think, does Allah hear our conversations? The second said: I think that when we speak loudly, He hears us, and when we do not raise our voices, He does not hear us. The third said: If He can hear something, then He can hear everything. I mentioned this to the Prophet (peace and blessings be upon him), so Allah revealed this verse: «﴿وَمَا كُنْتُمْ تَسْتَتِرُونَ أَنْ يَشْهَدَ عَلَيْكُمْ سَمْعُكُمْ وَلَا أَبْصَارُكُمْ وَلَا جُلُودُكُمْ . . . . . وَذَلِكُمْ ظَنُّكُمُ الَّذِي ظَنَنْتُمْ بِرَبِّكُمْ أَرْدَاكُمْ فَأَصْبَحْتُمْ مِنَ الْخَاسِرِينَ﴾» [فصلت : 22-23] "And you conceal things so that your ears, eyes, and skins may not bear witness against you... This is your lowly assumption about your Lord, and you have become among the losers."