On the authority of Abu Tha'labah al-Kushanee — Jurthoom bin Nashir (may Allah be pleased with him) — that the Messenger of Allah (peace and blessings of Allah be upon him) said:
Verily Allah ta'ala has laid down religious obligations (fara'id), so do not neglect them; and He has set limits, so do not overstep them; and He has forbidden some things, so do not violate them; and He has remained silent about some things, out of compassion for you, not forgetfulness — so do not seek after them.A hasan hadeeth narrated by ad-Daraqutnee and others.
Reference: 40 Hadith Nawawi 30
English translation: Hadith 30