What is the explanation of the Sacred Hadith: "If I test My servant and he does not complain about Me to his visitors, I will release him from My bonds, then I will replace his flesh with better flesh and his blood with better blood, then he will resume his work"? And what are the bonds of Allah?

This Hadith was narrated by Al-Hakim and Al-Bayhaqi from Abu Hurairah, raised [to the Prophet]: "Allah, blessed and exalted, said: 'If I test My believing servant, and he does not complain about Me to those who visit him, I will release him from My bonds, then I will replace his flesh with better flesh, and his blood with better blood, then he will resume his deeds.'" It was authenticated by Al-Hakim, Al-Dhahabi, and Al-Albani.

Its meaning is that if Allah tests His believing servant and he endures patiently, and does not complain about his pains to his visitors, He will cure him of his illness and replace it with health and well-being, and forgive his sins so that he may begin righteous deeds anew.