What is the explanation of the Hadith: "Whoever says, after the Dawn Prayer: 'There is no god but Allah, alone, without partner; to Him belongs all sovereignty and all praise; He gives life and causes death; in His hand is all goodness; and He is over all things competent,' one hundred times, before he folds his legs, will be on that day among the best people on Earth in deeds, except for one who says the same as he said, or adds to what he said"? And specifically, the phrase "قبل أن يثني رجليه" (before he folds his legs) – does it mean before he moves them from the squatting position?