(Al-Hijr) 15 : 52
إِذْ دَخَلُوا عَلَيْهِ فَقَالُوا سَلَامًا قَالَ إِنَّا مِنْكُمْ وَجِلُونَ
When they entered upon him and said: "Peace." He said: "Indeed, we are fearful upon you".
The Angels came as guests to Messenger Ibrahim is explained in verses 11: 69-76. See explanation 2: 210 and 6: 8.