Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates: The Prophet (peace and blessings be upon him) said: "Whoever walks to his creditor with his due, the creatures of the earth and the fish of the water pray for mercy for him; for every step, a tree is planted for him in Paradise, and one of his sins is forgiven."
Al-Bazzar recorded it; its chain contains a group of narrators for whom I have not found anyone who wrote their biographies.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب البيوع / 6684