Source

File: wp-includes/comment-template.php

function get_comment_text( $comment_ID = 0, $args = array() ) {
	$comment = get_comment( $comment_ID );

	$comment_content = $comment->comment_content;

	if ( is_comment_feed() && $comment->comment_parent ) {
		$parent = get_comment( $comment->comment_parent );
		if ( $parent ) {
			$parent_link = esc_url( get_comment_link( $parent ) );
			$name        = get_comment_author( $parent );

			$comment_content = sprintf(
				/* translators: %s: Comment link. */
				ent2ncr( __( 'In reply to %s.' ) ),
				'<a href="' . $parent_link . '">' . $name . '</a>'
			) . "\n\n" . $comment_content;
		}
	}

	/**
	 * Filters the text of a comment.
	 *
	 * @since 1.5.0
	 *
	 * @see Walker_Comment::comment()
	 *
	 * @param string     $comment_content Text of the comment.
	 * @param WP_Comment $comment         The comment object.
	 * @param array      $args            An array of arguments.
	 */
	return apply_filters( 'get_comment_text', $comment_content, $comment, $args );
}