Samson prayed that Gd help him against the Philistines as a reward for the fact that in twenty years of judging Israel, Samson had never requested the smallest favor from anyone: Sotah 10a
Rabbi Yochanan said he should have overridden the biblical imperative to help family members, because helping them could make him, as an important person, seem to be guilty of nepotism in their litigation [even though he was not a judge in the case]: Ketuvot 52b
