Hadithcore
Mishkat al-Masabih, 2251, 2252

Anas reported God's messenger as saying, “Let one of you ask his Lord for all that he needs, even for the thong of his sandal when it is cut.” He added in a version from Thabit al-Bunani in <i>mursal</i> form, “even asking Him for salt, and even asking Him for his thong when it is cut.” Tirmidhi transmitted it.

عَنْ أَنَسٍ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لِيَسْأَلْ أَحَدُكُمْ رَبَّهُ حَاجَتَهُ كُلَّهَا حَتَّى يَسْأَلَهُ شِسْعَ نَعله إِذا انْقَطع» زَادَ فِي رِوَايَةٍ عَنْ ثَابِتٍ الْبُنَانِيِّ مُرْسَلًا «حَتَّى يَسْأَلَهُ الْمِلْحَ وَحَتَّى يَسْأَلَهُ شِسْعَهُ إِذَا انْقَطع» . رَوَاهُ التِّرْمِذِيّ

References1 variant
In-Book Reference
Book 9, Hadith 27