وَأَمَّا الصِّدْقُ فَقَدْ شَاعَ فِي الْأَقْوَالِ خَاصَّةً
The use of ṣidq is especially common with statements.
Ṣidq concerns the truthfulness of an assertion: does the reported proposition correspond to the facts?
“The caravan has arrived” is a true report if it has actually arrived. If it is still traveling, the proposition is false, even if the reporter believed it without checking.