No iman without trustworthiness
لَا إِيمَانَ لِمَنْ لَا أَمَانَةَ لَهُ، وَلَا دِينَ لِمَنْ لَا عَهْدَ لَهُ
La imana li-man la amanata lah, wa la dina li-man la 'ahda lah.
"There is no faith for the one who is not trustworthy, and no religion for the one who does not keep his word."
Narrated by Anas ibn Malik. Musnad Ahmad 12383 (hasan)
A short reflection
Your iman shows up in returned borrowed money, called-back phone calls, and kept promises — before it shows up in salah.