It is narrated in Bihar al-Anwar that Allah revealed to Prophet Moses (AS), ‘O Moses, ask Me for every single thing that you need, even the grass for your sheep to graze and the salt for your food.
فيما أوحَى اللّهُ إلى موسى (عَلَيهِ الّسَلامُ): يا موسى ، سَلْني كلَّ ما تَحتاجُ إلَيهِ ، حتّى عَلَفَ شاتِكَ ، ومِلحَ عَجينِكَ.