It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Some people of my Ummah will recite the Qur'an and delve deep (and go to excess) in religion. Satan will come to them and say: Why do you not go to the kings and get something of their worldly goods, and keep yourselves apart from them with your religion? Beware! That can never be. Just as nothing but thorns can be gathered from the qatad (a thorny tree), likewise nothing but sins is gained from closeness to them."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Ibn Abbas (may Allah be pleased with them both) only with this chain; Hisham bin Ammar is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 8236
Hadith Takhrij«أخرجه الضياء المقدسي فى «الأحاديث المختارة» برقم: 154، وابن ماجه فى «سننه» برقم: 255»