BhG 17.21

syntax

yat tu (but which) praty-upakārārtham (for the sake of getting in return) phalam uddiśya vā (or aiming at the fruit)
punaḥ ca (and moreover) parikliṣṭam (grudgingly) dīyate (it is given),
tat dānam (that gift) rājasam (rajasic) smṛtam (it is known).

grammar

yat	–	yat sn. 1n.1 n. – that which;
tu	–	av. – but, then, or, and;
praty-upakāra-artham	–	av. praty-upakārasyārtham iti – for the sake of getting in return (from: prati- – prepositon: against, opposed; upa-√kṛ – to help, to serve, upakāra – help, favour, service; √arth – to strive to obtain, to desire, to request, artha – purpose, advantage, concern, object, wealth, use, suffix: for the sake of, on account of);
phalam	–	phala 2n.1 n. – fruit, result (from: √phal – to ripen);
uddiśya	–	ut-√diś (mieć na celu) absol. – aiming at;
vā	–	av. – or, and, on the other side, but even if, however;
punaḥ	–	av. – back, again, moreover;
dīyate	–	√dā (to give) Praes. pass. 1v.1 – it is given;
ca	–	av. – and;
parikliṣṭam	–	av. – grudgingly, unwillingly (from: pari-√kliś – to suffer, PP pari-kliṣṭa – troubled, pained);
tat	–	tat sn. 1n.1 n. – that;
dānam	–	dāna 1n.1 n. – gift, charity (from: √dā – to give);
rājasam	–	rājasa 1n.1 n. – related to rajas, rajasic (from: √rañj – to be dyed, be excited, be delighted, rajas – coloured, dust, passion, one of the three guṇas);
smṛtam	–	smṛta (√smṛ – to think, to remember) PP 1n.1 n. – it is known, it is remembered;

textual variants

parikliṣṭaṁ → parikruṣṭaṁ (cried over);
tad dānaṁ rājasaṁ smṛtam → tad rājasam iti smṛtam / tad rājasam udāhṛtam (that as rajasic is known / that is called rajasic);

Śāṃkara

yat tu dānaṃ pratyupakārārthaṃ kāle tv ayaṃ māṃ pratyupakariṣyatīty evam artham, phalaṃ vāsya dānasya me bhaviṣyaty adṛṣṭam iti | tad uddiśya punar dīyate ca parikliṣṭaṃ kheda-saṃyuktam, tad dānaṃ rājasaṃ smṛtam

Rāmānuja

pratyupakārakaṭākṣagarbhaṃ phalam uddiśya ca, parikliṣṭam akalyāṇadravyakaṃ yad dānaṃ dīyate, tad rājasam udāhṛtam

Śrīdhara

rājasaṃ dānam āha yad iti | kālāntare ‚yaṃ māṃ pratyupakariṣyatīty evam arthaṃ phalaṃ vā svargādikam uddiśya yat punar dānaṃ dīyate parikliṣṭaṃ citta-kleśa-yuktaṃ yathā bhavati evambhūtaṃ tad dānaṃ rājasam udāhṛtam

Madhusūdana

pratyupakārārthaṃ kālāntare mām ayaṃ upakariṣyatīty evam dṛṣṭārthaṃ phalaṃ vā svargādikam uddiśya yat punar dānaṃ sāttvika-vilakṣaṇaṃ dīyate parikliṣṭaṃ ca katham etāvad vyayitam iti paścāt tāpa-yuktaṃ yathā bhavaty evaṃ ca yad dīyate tad dānaṃ rājasam udāhṛtam

Viśvanātha

para-kliṣṭaṃ katham etāvad vyayitam iti paścāt-tāpa-yuktam | yad vā ditsāyāṃ abhāve ‚pi gurv-ādyājñānrodha-vaśād eva dattam | parikliṣṭam akalyāṇa-dravya-karmakam

Baladeva

yat tu pratupakārārthaṃ dṛṣṭa-phalārthaṃ phalaṃ vā svargādikam adṛṣṭam uddiśyānusandhāya dīyate tad dānaṃ rājasam | parikliṣṭaṃ katham etāvad vyayitavyam iti paścāt-tāpa-yuktaṃ yathā syāt tathā guru-vākyānurodhād vā yad dīyate tad rājasam