Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates the hadith about the sanctuary of Makkah, and the saying of the Prophet (peace and blessings be upon him): "Its trees are not to be cut, nor its thorns uprooted." He said: Sayyiduna Abbas bin Abd al-Muttalib (may Allah be pleased with him) said: O Messenger of Allah! Except idhkhir, for we use it in our houses and our graves. The Messenger of Allah (peace and blessings be upon him) said: "Except idhkhir, except idhkhir."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6725