In The Name of Allaah, The Most Merciful, The Bestower of Mercy
Sulaymaan Ibn Daawud Al-Abbaasiy [rahimahullaah] was a pious scholar and [Imaam] Ahmad [rahimahullaah] used to say about him, “He is fit for the khilaafah.” He [i.e. Sulaymaan] said, “It maybe that I narrate a single hadeeth with a sincere intention, but when I reach some of its [wording], my intention changes. Therefore, [narrating] a single hadeeth requires [sincere] intentions.”
Shaikh Rabee then said: That is because shaytaan interferes. You speak about a hadeeth and transmit it to another person, then shaytaan interferes and corrupts your intention [by] way of Riyaa and a desire to be heard, so that it is said, “Such and such is a scholar, such and such is a haafidh.” Therefore, every hadeeth [you narrate] requires a [sincere] intention. You must always [earnestly pay attention] to [sincere] intention, so that your deed is [carried out] for the sake of Allaah.
Marhaban Yaa Taalibal Ilm. Page 259. Slightly paraphrased