Can a wife receive a blood transfusion from her husband?

My cousin's wife gave birth to a child and at that time she needs blood urgently, her husband (my cousin) gave blood to her. But later on some of people said them, that it is not permissible in islam (they didn't gave any hadith regarding this matter). I just want to know can a husband give blood to his wife? Is it permissible in Islam if yes then please elaborate with Quran or Hadith?