Sunnah.com reference : Book 8, Hadith 61English translation : Book 8, Hadith 0Arabic reference : Book 8, Hadith 1016
A narration by al-Bukhari has:
"When one of you has been away from home for a long time, he must not come to his family during the night."
وَفِي رِوَايَةٍ لِلْبُخَارِيِّ : { إِذَا أَطَالَ  1‏ أَحَدُكُمُ الْغَيْبَةَ , فَلَا يَطْرُقْ أَهْلَهُ لَيْلاً }   2‏ .‏‏1 ‏- في " أ " : " طال " وهو تحريف.‏‏2 ‏- صحيح .‏ رواه البخاري ( 5244 )‏.‏