What is the ruling on the one who abandons the prayer?

Question:
He says: What is the ruling on the one who abandons the prayer while he testifies that there is no god but Allah and that Muhammad is the Messenger of Allah?

Answer:
La ilaha illa Allah does not benefit him, because he has nullified it. He nullified it by abandoning the prayer, because abandoning the prayer is kufr (disbelief) that contradicts the word "La ilaha illa Allah." If one says "La ilaha illa Allah," he must adhere to its meaning and its implications. One of the greatest of its implications is establishing the prayer. So this is abandoning the first thing among the implications of "La ilaha illa Allah," which is the prayer.
So "La ilaha illa Allah" does not benefit him. Likewise, the one who says "La ilaha illa Allah" and then says, "O Ali, O Husayn," calling upon other than Allah, is a mushrik (one who associates partners with Allah), and "La ilaha illa Allah" does not benefit him, because he has corrupted it. He corrupted this word with shirk (associating partners with Allah), just as the one who performs wudu' (ablution) and then has a state of ritual impurity, his wudu' is nullified. This one says the word of tawhid (the oneness of Allah) and then commits shirk, so his tawhid is nullified. It is necessary to know these matters. Yes.