Quran 2:131

Surah Al-Baqarah. Verse: 131. Tafsir Ibn Kathir.

إِذۡ قَالَ لَهُ ۥ رَبُّهُ ۥۤ أَسۡلِمۡ‌ۖ قَالَ أَسۡلَمۡتُ لِرَبِّ ٱلۡعَـٰلَمِينَ

[131. When his Lord said to him, "Submit (i.e. be a Muslim)!" He said, "I have submitted myself (as a Muslim) to the Lord of the `Alamin (mankind, Jinn and all that exists)]

This Ayah indicates that Allah commanded Ibrahim to be sincere with Him and to abide and submit to Him; Ibrahim perfectly adhered to Allah's command. He (AS) submitted himself 100% to Allah swt and did whatever His Rabb commanded Sub'han Allaah! Prophet Ibraheem (AS) was tested with everything that a person can possibly develop love for, yet he remained steadfast till the very end. Allah's statement,

﴿ وَوَصَّىٰ بِہَآ إِبۡرَٲهِـۧمُ بَنِيهِ وَيَعۡقُوبُ ﴾

(And this (submission to Allah, Islam) was enjoined by Ibrahim upon his sons and by Ya`qub) means, Ibrahim commanded his offspring to follow this religion, that is, Islam, for Allah. Or, the Ayah might be referring to Ibrahim's words,

﴿ أَسۡلَمۡتُ لِرَبِّ ٱلۡعَـٰلَمِينَ ﴾

(I have submitted myself (as a Muslim) to the Lord of the `Alamin (mankind, Jinn and all that exists)).

This means that these Prophets loved these words so much that they preserved them until the time of death and advised their children to adhere to them after them.