Ubayd bin Umayr (may Allah have mercy on him) says that Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) was addressing the people at Mina when he saw a man on a mountain cutting down trees. He summoned him and asked him: Do you not know that the trees of Makkah are not to be cut down and its fresh grass is not to be cut? He said: Of course, but an emaciated camel of mine drove me to it. So he (Umar) gave him a camel to ride, and said to him: Do not do it again; and he did not impose any penalty on him.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9949