There were visible and audible evidences of this. The disciples spoke in a variety of tongues “about the magnificent things of God. ”
قَالَ يَسُوعُ لِرُسُلِهِ :‏ « عِنْدِي بَعْدُ أُمُورٌ كَثِيرَةٌ أَقُولُهَا لَكُمْ ،‏ وَلٰكِنَّكُمْ لَا تَسْتَطِيعُونَ أَنْ تَتَحَمَّلُوهَا ٱلْآنَ .‏