That Sa'd b. 'Ubadah said to the Messenger of Allah ﷺ : What do you think if I find with my wife a man ; should I give him some time until I bring four witnesses ?" He said: "Yes". (Using translation from Abū Dāʾūd 4533)  

يَا رَسُولَ اللهِ أَرَأَيْتَ إِنْ وَجَدْتُ مَعَ امْرَأَتِي رَجُلًا أُمْهِلُهُ حَتَّى آتِيَ بِأَرْبَعَةِ شُهَدَاءَ؟ قَالَ «نَعَمْ»