四分律比丘含注戒本 2.77

2.77

若說不了，吉羅；若向非人、畜生說，過亦爾。不犯者：若五、六語；有智男前過說；若無有智男前問，應答廣說；若授優婆夷五戒，乃至說五戒法；與受八關齋，說八關齋法、八聖道、十不善法；女人問義不解，廣說並得。

If one speaks without completing it, it is a duṣkṛta. If one speaks to a non-human or an animal, the offense is also like this. Cases of non-offense: speaking five or six sentences; speaking excessively before an intelligent man; if there is no intelligent man present and one is questioned, it is permissible to answer and speak at length; if conferring the five precepts on an upāsikā, up to explaining the Dharma of the five precepts; giving the eightfold poṣadha precepts, expounding the eightfold poṣadha precepts, the eight noble paths, and the ten unwholesome dharmas; if a woman asks about the meaning because she does not understand, to speak at length—all are permissible.