Belief in the angels entails that every male and female Muslim believe that Allah created the angels so that they could worship Him. He describes them as honored slaves who do not say a word before He commands them to do so, and act only upon His order.
Allah says about themin Quran;
يَعْلَمُ مَا بَيْنَ أَيْدِيهِمْ وَمَا خَلْفَهُمْ وَلَا يَشْفَعُونَ إِلَّا لِمَنِ ارْتَضَىٰ وَهُمْ مِنْ خَشْيَتِهِ مُشْفِقُونَ
“He knows what is before them, and what is behind them, and they cannot intercede except for him with whom He is pleased. And they stand in awe out of fear of Him.”
The angels are delicate beings created from light. They have power to change themselves into various beautiful forms with their main function being to worship Allah. They mostly live in the heavens.
In an authentic Hadith collected by Muslim on the authority of ‘A’ishah (May Allah be pleased with her), the Prophet (Peace and Blessings of Allah be upon him) said, “The angels were created from light, the jinn were created from fire and Adam was created from what has being described to you.”
Allah also says about them,
يُسَبِّحُونَ اللَّيْلَ وَالنَّهَارَ لَا يَفْتُرُونَ
“They (i.e. the angels) glorify His Praises night and day, (and) they never slacken (to do so).”
Allah also says,
لَا يَعْصُونَ اللَّهَ مَا أَمَرَهُمْ وَيَفْعَلُونَ مَا يُؤْمَرُونَ
“They disobey not, (from executing) the Commands they receive from Allah, but do that which they are commanded.”
Regarding the angels as masculine is a sin while regarding them as feminine is disbelief.