Harithah bin Mudarrib (may Allah have mercy on him) said: I was sitting with Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) when two men came. One of them gave the greeting of salam and the other did not. We said, or he said: Has your companion not given the greeting? He said: He has vowed a fast of not speaking to any human being. The narrator said: Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: What you have said is wrong. Rather, that was a woman who offered it as an excuse; they rejected her child, saying it was from fornication. Enjoin good and forbid evil; that is better for you.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النذور / 20098