Albert Barnes' Notes on the Whole Bible - Leviticus 14:7
Seven times - The seal of the covenant, expressed in the number seven (compare Leviticus 14:9), was renewed in sprinkling him who, during his leprosy, had lived as an outcast. The details of a restoration to health and freedom appear to be well expressed in the whole ceremony. Each of the birds represented the leper. They were to be of a clean kind, because they stood for one of the chosen race. The death-like state of the leper during his exclusion from the camp was expressed by killing one of... read more
The Pulpit Commentary - Leviticus 14:7
And he shall sprinkle upon him that is to be cleansed from the leprosy seven times. It is not certain whether the seven sprinklings were made upon the forehead of the person to be cleansed, or on the back of his hand. The feathers of the bird and the bunch of hyssop would be specially instrumental in the seven sprinklings. And shall pronounce him clean. Having assured himself that he was healed ( Leviticus 14:3 ), the priest now pronounces him to be clean, he looses as well as binds. It... read more