Only if they produced four witnesses (you may believe them). If they fail to produce the witnesses, then they are, according to God, liars.
لَولا جاءو عَلَيهِ بِأَربَعَةِ شُهَداءَ فَإِذ لَم يَأتوا بِالشُّهَداءِ فَأُولٰئِكَ عِندَ اللَّهِ هُمُ الكٰذِبونَ
law laa jaaa’oo ‘alaihi bi-arba’ati shuhadaaa’; fa iz lam yaatoo bishshuhadaaa’i fa ulaaa ‘ika ‘indal laahi humul kaaziboon