[He] said: "I am only a messenger from your Lord, to bestow upon you a pure boy." That is: righteous.
﴿قَالَ إِنَّمَا أَنَا رَسُولُ رَبِّكِ لِيهَبَ لَكِ غُلَامًا زَكِيًّا﴾ أَيْ: صَالحا