باب استحباب إعادة السلام عَلَى من تكرَّر لقاؤه عَلَى قرب بأن دخل ثم خرج ثُمَّ دخل في الحال، أَو حال بينهما شجرة ونحوها
Hadith 859 - Bab 134 (Excellence of Greeting the Acquaintance Repeatedly)
Chapter 6 (The Book of Greetings)
Abu Hurairah (May Allah be pleased with him)reported in the Hadith in respect of the person who was at fault in performing his Salat (prayer): He came to the Prophet (Peace be upon him) and greeted him. The Prophet (Peace be upon him) responded to the greeting and said, "Go back and repeat your Salat because you have not performed the Salat (properly).'' He again performed Salat as he had prayed before and came to the Prophet (Peace be upon him) and greeted him. The Prophet (Peace be upon him) responded to the greetings (and repeated his words to him). This act of repeating (the Salat and the Salam) was done thrice.
[Al-Bukhari and Muslim].
860 وعنه عن رسول اللَّه صَلّى اللهُ عَلَيْهِ وسَلَّم قَالَ: "إِذَا لقيَ أَحَدَكُمْ أخَاهُ فَلْيُسَلِّمْ عَلَيْهِ، فَإنْ حالَتْ بَيْنَهُمَا شَجَرَةٌ أَوْ جِدَارٌ أوْ حَجَرٌ ثُمَّ لَقِيَهُ فَلْيُسَلِّمْ عَلَيْه" رواه أَبُو داود.
Hadith 860 - Bab 134 (Excellence of Greeting the Acquaintance Repeatedly)
Chapter 6 (The Book of Greetings)
Abu Hurairah (May Allah be pleased with him) reported: Messenger of Allah (Peace be upon him) said, "When one of you meets a brother (in Faith) he should greet him. Then if a tree or a wall or a stone intervenes between them and then he meets him again, he should greet him."
[Abu Dawud].