Sunan an Nasai
2579
Sahih+2

It was narrated that Qubaisah bin Mukhariq said:"I undertook a financial responsibility. [1] Then I came to the Prophet and asked him (for help) concerning that. He said: 'Asking (for money) is not permissible except for three: A man who undertakes a financial responsibility between people; he may ask for help with that until the matter is settled, then he should refrain (from asking)

SahihAbu Ghuddah
SahihAl-Albani