Ibn Kathir (Abridged)
Hafiz Ibn KathirAllah emphasizes the enmity that the hypocrites have for the Prophet
If a blessing, such as victory and triumph over the enemies, is given to the Prophet , thus pleasing him and his Companions, it grieves the hypocrites, وَإِن تُصِبْكَ مُصِيبَةٌ يَقُولُواْ قَدْ أَخَذْنَا أَمْرَنَا مِن قَبْلُ(but if a calamity overtakes you, they say: "We took our precaution beforehand,"), they say, we took precautions when we did not join him, وَيَتَوَلَّواْ وَّهُمْ فَرِحُونَ(and they turn away rejoicing.) Allah directed His Prophet to reply to the perfect enmity they have towards him, قُلْ(Say), to them, لَّن يُصِيبَنَآ إِلاَّ مَا كَتَبَ اللَّهُ لَنَا(Nothing shall ever happen to us except what Allah has ordained for us.) for we are under His control and decree, هُوَ مَوْلَـنَا(He is our Mawla.), Master and protector, وَعَلَى اللَّهِ فَلْيَتَوَكَّلِ الْمُؤْمِنُونَ(And in Allah let the believers put their trust) 9:51, and we trust in Him. Verily, He is sufficient for us and what an excellent guardian.