Anger over the bill grew into sometimes violent protests calling for more freedoms for Hong Kong, which returned to Chinese rule in 1997 under a "one country, two systems" formula.
Hong Kong leader Carrie Lam formally scrapped the bill last week as part of concessions aimed at ending the protests.
"Hong Kong is an inseparable part of China, and that is the bottom line no one should challenge, not the demonstrators, not the foreign forces playing their dirty games," the China Daily said in an editorial.
"The demonstrations in Hong Kong are not about rights or democracy. They are a result of foreign interference. Lest the central government's restraint be misconstrued as weakness, let it be clear secessionism in any form will be crushed," it said.