Is it bad karma if you say something that turns out to be false?

In DN 27 , the Buddha said that the Brahmins make bad karma for speaking falsely. > “Actually, Vāseṭṭha, the brahmins are forgetting their tradition when they say this to you. For brahmin women are seen menstruating, being pregnant, giving birth, and breast-feeding. Yet even though they’re born from a brahmin womb they say: Only brahmins are the first caste; other castes are inferior. Only brahmins are the light caste; other castes are dark. Only brahmins are purified, not others. Only brahmins are Brahmā’s rightful sons, born of his mouth, born of Brahmā, created by Brahmā, heirs of Brahmā.’ **They misrepresent the brahmins, speak falsely, and make much bad karma.** So my question is do you get bad karma if you say something you thought was true but turned out to be false?