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Ibn ‘Umar reported God's messenger as saying, “If the gate of supplication is opened for any of you, the gates of mercy will be opened for him, and God is not asked for anything He likes so much as to be asked for security.” Tirmidhi transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ فُتِحَ لَهُ مِنْكُمْ بَابُ الدُّعَاءِ فُتِحَتْ لَهُ أَبْوَابُ الرَّحْمَةِ وَمَا سُئِلَ اللَّهُ شَيْئًا يَعْنِي أَحَبَّ إِلَيْهِ مِنْ أَنْ يُسْأَلَ الْعَافِيَةَ» . رَوَاهُ التِّرْمِذِيّ
sunnah.com