Is sneezing a testimony to the truthfulness of speech, and does it have a Shar'i basis?

There is a weak hadith which states that sneezing is a witness to truth, such as "Whoever narrates a narration and sneezes near him, it is true" and "The truest narration is that near which one sneezes." However, it is false and cannot be believed due to the weakness of its chain of transmission, as such a matter cannot be established except by a legal text.