Imam al-Shafi'i (may Allah have mercy on him) said: "We know of no one among people, except very few, who has pure obedience and decency without mixing them with any sin or abandonment of decency; nor is there anyone who has pure sin and abandonment of decency without any mixture of obedience and decency."
The Shaykh (Imam al-Bayhaqi) (may Allah have mercy on him) said: "It is just as Imam al-Shafi'i (may Allah have mercy on him) said."
Sayyiduna Abdullah (may Allah be pleased with him) said: When this verse was revealed: "Those who believe and do not mix their faith with wrongdoing" [Surah al-An'am: 82], the Companions (may Allah be pleased with them) asked: "Which of us does not mix his faith with wrongdoing?" Then this verse was revealed: "Do not associate partners with Allah; indeed, associating partners with Allah is a great wrong." [Surah Luqman: 13]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20742