Quran 5:35: Allah swt instructs us to seek intercession.
Quran: Al-Ma'idah 5:35
Translation: Maarif ul-Quran

O those who believe, fear Allah and seek the wasiIlah of nearness to Him, and carry out Jihad in His way so that you may succeed.

یَـٰۤأَیُّهَا ٱلَّذِینَ ءَامَنُوا۟ ٱتَّقُوا۟ ٱللَّهَ وَٱبۡتَغُوۤا۟ إِلَیۡهِ ٱلۡوَسِیلَةَ وَجَـٰهِدُوا۟ فِی سَبِیلِهِۦ لَعَلَّكُمۡ تُفۡلِحُونَ

Reference  : Quran: Al-Ma'idah 5:35
 
Rasulullah intercedes for a blind man.
Jami` at-Tirmidhi 3578
Narrated Uthman bin Hunaif:

A blind man came to the Prophet (ﷺ) and said: “Supplicate to Allah to heal me.” He (ﷺ) said: “If you wish I will supplicate for you, and if you wish, you can be patient, for that is better for you.” He said: “Then supplicate to Him.” He said: “So he ordered him to perform Wudu’ and to make his Wudu’ complete, and to supplicate with this supplication: ‘O Allah, I ask You and turn towards You by Your Prophet Muhammad (ﷺ), the Prophet of Mercy. Indeed, I have turned to my Lord, by means of You, concerning this need of mine, so that it can be resolved, so O Allah so accept his intercession for me (Allāhumma innī as’aluka wa atawajjahu ilaika binabiyyka Muḥammadin nabi-ir-raḥmati, innī tawajjahtu bika ila rabbī fī ḥājatī hādhihī lituqḍā lī, Allāhumma fashaffi`hu fīyya).’”

حَدَّثَنَا مَحْمُودُ بْنُ غَيْلاَنَ، حَدَّثَنَا عُثْمَانُ بْنُ عُمَرَ، حَدَّثَنَا شُعْبَةُ، عَنْ أَبِي جَعْفَرٍ، عَنْ عُمَارَةَ بْنِ خُزَيْمَةَ بْنِ ثَابِتٍ، عَنْ عُثْمَانَ بْنِ حُنَيْفٍ، أَنَّ رَجُلاً، ضَرِيرَ الْبَصَرِ أَتَى النَّبِيَّ صلى الله عليه وسلم فَقَالَ ادْعُ اللَّهَ أَنْ يُعَافِيَنِي ‏.‏ قَالَ ‏"‏ إِنْ شِئْتَ دَعَوْتُ وَإِنْ شِئْتَ صَبَرْتَ فَهُوَ خَيْرٌ لَكَ ‏"‏ ‏.‏ قَالَ فَادْعُهُ ‏.‏ قَالَ فَأَمَرَهُ أَنْ يَتَوَضَّأَ فَيُحْسِنَ وُضُوءَهُ وَيَدْعُوَ بِهَذَا الدُّعَاءِ ‏"‏ اللَّهُمَّ إِنِّي أَسْأَلُكَ وَأَتَوَجَّهُ إِلَيْكَ بِنَبِيِّكَ مُحَمَّدٍ نَبِيِّ الرَّحْمَةِ إِنِّي تَوَجَّهْتُ بِكَ إِلَى رَبِّي فِي حَاجَتِي هَذِهِ لِتُقْضَى لِي اللَّهُمَّ فَشَفِّعْهُ فِيَّ ‏"‏ ‏.‏ قَالَ هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ غَرِيبٌ لاَ نَعْرِفُهُ إِلاَّ مِنْ هَذَا الْوَجْهِ مِنْ حَدِيثِ أَبِي جَعْفَرٍ وَهُوَ غَيْرُ الْخَطْمِيِّ وَعُثْمَانُ بْنُ حُنَيْفٍ هُوَ أَخُو سَهْلِ بْنِ حُنَيْفٍ ‏.‏
Grade: Sahih (Darussalam)
Reference  : Jami` at-Tirmidhi 3578
In-book reference  : Book 48, Hadith 209