Confusion about Qur'an Qur’an 33:37 and 33:4-5 and Adoption ruling?

We know that in Islam adoption is not allowed Qur'an verses Qur’an 33:37 and 33:4-5 pertain to that. My Question is which of these verses came first, 33:4-5 or 33:37 in terms of order of revelation!?! Did adoption become haram after Prophet Muhammad s.a.w married Zaynab or before in 33:4-5