Sayyiduna Suhaib (may Allah be pleased with him) narrates this statement of the Noble Prophet (peace and blessings of Allah be upon him): "The affair of the believing servant is astonishing; his matter is good in every situation. If he receives good news, he is grateful. If he faces distress, he is patient, and that too is better for him. This quality is possessed only by the believer."
Hadith Referenceصحیح ابن حبان / كتاب الجنائز وما يتعلق بها مقدما أو مؤخرا / 2896
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - «الصحيحة» (147): م.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح على شرط مسلم