Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "I fear five things for my Ummah: denying destiny (qadar), believing in the stars."
Abu Ya'la recorded it in this way, limiting it to two of the five things; its chain contains a narrator, Yazid al-Raqashi, who is da'if (weak), though Ibn Adi declared him thiqah (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب القدر / 11861