It was narrated from Ibn Abbas that the Prophet (ﷺ) said:
"If one man says another: 'O effeminate one!' give him twenty lashes. And if one man says to another: 'O homosexual!' give him twenty twenty lashes." (JA)
English reference (JA): Vol. 3, Book 20, Hadith 2568 (JA)
Arabic reference (JA): Book 20, Hadith 2665 (JA)