On which days must the water with ashes of the red heifer be sprinkled on a corpse-impure person?
Halacha 1 states purification from corpse-impurity requires sprinkling on the third and seventh days, followed by immersion in a mikveh.
Question 2
What is the ideal (optimum) hyssop for performing the mitzvah?
Halacha 4 states the optimum way to fulfill the mitzvah is to use three stalks, with each stalk bearing a bud of flowers.
Question 3
If a person impure from a corpse delays beginning the purification process by several days, how many sprinklings does he need?
Halacha 2 states that whenever the person begins the purification, only the standard two sprinklings (third and seventh days) are required — delay does not add requirements.
Question 4
Is hyssop from a city that was 'led astray' (ir hanidachat) valid for sprinkling?
Halacha 6 lists hyssop from a city that was led astray among the disqualified types — it may not be used for the purification sprinkling.
Question 5
Can hyssop that was gathered for kindling be used for sprinkling after liquids fell on it?
Halacha 7 rules that if liquids fell on hyssop gathered for kindling, one may dry it out and it becomes acceptable for sprinkling.