O you who have believed, seek help through patience and prayer. Indeed, Allah is with the patient.
Surat Al-Baqarah 2:153
Narrated Abdullah ibn Amr ibn al-‘As: The Prophet (peace be upon him) said: Knowledge has three categories; anything else is extra; a precise verse, or an established sunnah (practice), or a firm obligatory duty.
Sunan of Abu-Dawood – Book 18 Hadith 2879