It is narrated from Sayyiduna al-Hasan bin Ali (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Wherever you are, send blessings (salat) upon me, for your blessings reach me."
This hadith is narrated from Sayyiduna al-Hasan bin Ali (may Allah be pleased with him) only with this chain, and Ibn Abi Maryam (may Allah have mercy on him) is alone in narrating it.
Hadith Referenceالمعجم الأوسط / باب الألف / 365
Hadith Takhrij«أخرجه أبو يعلى فى «مسنده» برقم: 6761، وابن حجر فى «المطالب العالية» برقم: 599، وعبد الرزاق فى «مصنفه» برقم: 4839، والطبراني فى «الكبير» برقم: 2729»