Is it true that specifying numbers for multiplying the reward of Dhikr—such as saying that sending a particular Dhikr to a certain number of people brings such and such good deeds—and asserting that the Dhikr is not valid without it, is correct?

The two noble hadiths, "Two words that are beloved to the Most Merciful, light on the tongue, and heavy on the scale: Subhan Allah wa bihamdihi, Subhan Allah Al-Azim (Glory be to Allah and praise be to Him, Glory be to Allah the Almighty)" and "Whoever guides to good will have a reward like that of its doer," are authentic. However, one must be cautious about specifying a number of good deeds or promoting certain methods that have not been mentioned in the Sharia. Rather, a Muslim should call to all acts of obedience with sincerity and trust in Allah's promise not to waste the reward of those who do good.