I found some interesting references on the internet from the 2nd Khalifa. I have posted them in the below.
Mirza Basheeruddin Mahmud Ahmad, Friday Sermon, 5 June 1942
“Someone who calls himself an Ahmadi and then does not perform prayer, and by not performing prayer is not meant that he never performs prayer, but if he skips even one prayer throughout the year, or if he skips even one prayer in ten years, he cannot be called an Ahmadi under…
…any circumstances. If he thinks, ‘I have only skipped one prayer in twenty years, what’s the big deal?’, then he is suffering from a delusion. Even if he skips only a single prayer in twenty years, even then he cannot be called an Ahmadi. Rather, right then, when a person…
…skips any prayer, he leaves Ahmadiyyat, and until regret and repentance for his deed does not reappear in his heart, and until desire for faith does not reappear in his heart, he is not considered an Ahmadi before God Almighty.”
Links and Related Essay’s