Al-Furqaan 28

يَٰوَيْلَتَىٰ لَيْتَنِى لَمْ أَتَّخِذْ فُلَانًا خَلِيلًا ﴿٢٨﴾

Ya waylata laytanee lam attakhith fulanan khaleelan

"Ah! Woe to me! Would that I had never taken so-and-so as a friend! The Noble Quran