I think Medi1Saif is referring to:
Narrated Abu Huraira:
Allah's Messenger (ﷺ) said, "Allah said, 'I will declare war against him who shows hostility to a pious worshipper of Mine. And the most beloved things with which My slave comes nearer to Me, is what I have enjoined upon him; and My slave keeps on coming closer to Me through performing Nawafil (praying or doing extra deeds besides what is obligatory) till I love him, so I become his sense of hearing with which he hears, and his sense of sight with which he sees, and his hand with which he grips, and his leg with which he walks; and if he asks Me, I will give him, and if he asks My protection (Refuge), I will protect him; (i.e. give him My Refuge) and I do not hesitate to do anything as I hesitate to take the soul of the believer, for he hates death, and I hate to disappoint him." (Sahih al-Bukhari https://sunnah.com/bukhari/81/91)
Allah also says in the qur'an:
Unquestionably, [for] the allies of Allah there will be no fear concerning them, nor will they grieve (10:62 https://quranx.com/10.62)
Another hadith which was mentioned in ibn Hajar's commentary which goes along to the meaning of this one is:
... I heard the Messenger of Allah (ﷺ) say: ‘A little showing off is polytheism and whoever shows enmity towards a friend of Allah has declared war on Allah. Allah loves those who se righteousness and piety are hidden, those who, if they are absent, are not missed, and if they are present, they are not invited or acknowledged. Their hearts are lamps of guidance and they get out of every trial and difficulty.’” (Sunan ibn Majah https://sunnah.com/ibnmajah/36/64)